Australian Army Research Articles

The repeatability of stride time variability, regularity, and long-range correlations

BackgroundDetrended fluctuation analysis (DFA) and sample entropy (SE) measure the long-term correlations and regularity of gait patterns, respectively, having previously been used to identify participants at risk of falling, previous history of injury, or patients with motor diseases. Since these measures are more sensitive to gait impairment than linear measures (e.g., the standard deviation [SD] of stride time), they can be potentially used in military medicine to identify soldiers at risk of injury. However, clinometric properties are yet to be established. Research QuestionWhat is the repeatability of DFA, SE, and traditional linear measures of stride time variability (SD and coefficient of variation [CV]) under various load and speed constraints? MethodsFourteen Australian Army trainee soldiers (age: 25.6 ± 5.9 y, height: 1.74 ± 0.08 m, body mass: 77.2 ± 15.1 kg, service: 1.5 ± 1.8 y) attended three sessions over two weeks, completing four 12-minute walking trials on an instrumented treadmill in each session. Participants walked with a combination of 0 kg or 23 kg loads at a self-selected or 5.5 km/h speed. Heel contacts from the right foot were identified using treadmill-embedded force plates. From 512 stride time intervals, linear (SD and CV), and non-linear (DFA and SE) measures were obtained. To assess the between-session repeatability, intraclass correlations (ICC 2,1) were employed. Results and SignificanceThere was poor-to-moderate repeatability for the SD (ICC: 0.357–0.545) and CV (ICC: 0.371–0.529). DFA showed poor-to-moderate repeatability (ICC: 0.013–0.504), while SE had poor repeatability (ICC: 0.133–0.226). Previous studies have shown that differences of > 0.19 in DFA and > 0.66 in SE can differentiate between healthy and pathological gait. These values are greater than this study's reported standard error of measurement, indicating that clinically meaningful changes may still be detectable despite low repeatability.

The Owen Gun: Notes on Development & Evolution

This article examines the technical aspects of the controversial developmental history of the Owen sub-machine gun. The history of the gun’s development has been both politicised and mythologised, with the result that relatively little objective analysis of the design process has been undertaken. The author’s examination of documents (including patents, manufacturing data, official documents, and personal letters) and the weapons themselves provides an alternative perspective to these widely disseminated views. This article also addresses the problematic nature of statements made by the gun’s designers and promoters, which are at variance with other information and yet have largely been accepted uncritically in firearms literature. It also seeks to determine, where possible, which elements of the gun were the work of its nominal designer, Evelyn Owen, and which were likely the work of his various collaborators. The role of the Australian Army in the design is also examined in the hope of correcting misconceptions.

Patterns of substance use recovery following residential treatment: A repeated measures latent profile analysis.

Ongoing improvement to residential treatment for substance use disorders is critical as it typically targets people with the highest need. Assessing multiple recovery indicators, such as cravings and mental health, at intake and following discharge is important in evaluating treatment effectiveness. To refine services, research should explore whether there are subgroups of individuals with different patterns of recovery following treatment. Participants (n = 554) were attending Australian Salvation Army residential treatment services for substance use issues. Data were collected by surveys at intake and 3-month post-discharge ('early recovery'). Recovery indicators were cravings, confidence to resist substance use and the Depression, Anxiety and Stress Scale. Subgroups of individuals based on these recovery indicators ('profiles') were identified using repeated measures latent profile analysis. Five profiles were identified, three profiles improved over time (81.4%) and two (18.6%) deteriorated across all indicators. These two profiles had the poorest mental health and addiction scores at intake and reported shorter time in treatment compared to the three profiles showing improvement. There were no demographic or substance type differences between profiles. By considering initial severity and multiple recovery indicators at early recovery, this study suggests that individuals at-risk of poor early recovery can be identified at intake. This opens opportunities for tailored treatment approaches to address both mental health and substance use, thereby potentially improving treatment outcomes and reducing the risk of relapse.

The Agreement between Wearable Sensors and Force Plates for the Analysis of Stride Time Variability.

The variability and regularity of stride time may help identify individuals at a greater risk of injury during military load carriage. Wearable sensors could provide a cost-effective, portable solution for recording these measures, but establishing their validity is necessary. This study aimed to determine the agreement of several measures of stride time variability across five wearable sensors (Opal APDM, Vicon Blue Trident, Axivity, Plantiga, Xsens DOT) and force plates during military load carriage. Nineteen Australian Army trainee soldiers (age: 24.8 ± 5.3 years, height: 1.77 ± 0.09 m, body mass: 79.5 ± 15.2 kg, service: 1.7 ± 1.7 years) completed three 12-min walking trials on an instrumented treadmill at 5.5 km/h, carrying 23 kg of an external load. Simultaneously, 512 stride time intervals were identified from treadmill-embedded force plates and each sensor where linear (standard deviation and coefficient of variation) and non-linear (detrended fluctuation analysis and sample entropy) measures were obtained. Sensor and force plate agreement was evaluated using Pearson's r and intraclass correlation coefficients. All sensors had at least moderate agreement (ICC > 0.5) and a strong positive correlation (r > 0.5). These results suggest wearable devices could be employed to quantify linear and non-linear measures of stride time variability during military load carriage.

The test–retest reliability of physiological and perceptual responses during treadmill load carriage

PurposeUnderstanding the test–retest reliability of physiological responses to load carriage influences the interpretation of those results. The aim of this study was to determine the test–retest reliability of physiological measures during loaded treadmill walking at 5.5 km h−1 using the MetaMax 3B.MethodsFifteen Australian Army soldiers (9 male, 6 female) repeated two 12-min bouts of treadmill walking at 5.5 km h−1 in both a 7.2 kg Control condition (MetaMax 3B, replica rifle) and a 23.2 kg Patrol condition (Control condition plus vest) across three sessions, separated by one week. Expired respiratory gases and heart rate were continuously collected, with the final 3 min of data analysed. Ratings of Perceived Exertion and Omnibus-Resistance Exercise Scale were taken following each trial. Reliability was quantified by coefficient of variation (CV), intra-class correlation coefficients (ICC), smallest worthwhile change (SWC), and standard error of the measurement.ResultsMetabolic and cardiovascular variables were highly reliable (≤ 5% CV; excellent-moderate ICC), while the respiratory variables demonstrated moderate reliability (< 8% CV; good-moderate ICC) across both conditions. Perceptual ratings had poorer reliability during the Control condition (12–45% CV; poor ICC) than the Patrol condition (7–16% CV; good ICC).ConclusionsThe test–retest reliability of metabolic and cardiovascular variables was high and relatively consistent during load carriage. Respiratory responses demonstrated moderate test–retest reliability; however, as the SWC differed with load carriage tasks, such data should be interpreted independently across loads. Perceptual measures demonstrated poor to moderate reliability during load carriage, and it is recommended that they only be employed as secondary measures.Graphical abstract

Work-rest regimens for work in hot environments: A scoping review.

To limit exposures to occupational heat stress, leading occupational health and safety organizations recommend work-rest regimens to prevent core temperature from exceeding 38°C or increasing by ≥1°C. This scoping review aims to map existing knowledge of the effects of work-rest regimens in hot environments and to propose recommendations for future research based on identified gaps. We performed a search of 10 databases to retrieve studies focused on work-rest regimens under hot conditions. Forty-nine articles were included, of which 35 were experimental studies. Most studies were conducted in laboratory settings, in North America (71%), on healthy young adults, with 94% of the 642 participants being males. Most studies (66%) employed a protocol duration ≤240 min (222 ± 162 min, range: 37-660) and the time-weighted average wet-bulb globe temperature was 27 ± 4°C (range: 18-34). The work-rest regimens implemented were those proposed by theAmerican Conference of Governmental and Industrial Hygiene (20%),National Institute of Occupational Safety and Health (11%), or the Australian Army (3%). The remaining studies (66%) did not mention how the work-rest regimens were derived. Most studies (89%) focused on physical tasks only. Most studies (94%) reported core temperature, whereas only 22% reported physical and/or mental performance outcomes, respectively. Of the 35 experimental studies included, 77% indicated that core temperature exceeded 38°C. Although work-rest regimens are widely used, few studies have investigated their physiological effectiveness. These studies were mainly short in duration, involved mostly healthy young males, and rarely considered the effect of work-rest regimens beyond heat strain during physical exertion.

Upgrading the Army’s Fires Lethality: How the Australian Army Can Harness the Firepower Advantages of the Fourth Industrial Revolution

Upgrading the Army’s Fires Lethality: How the Australian Army Can Harness the Firepower Advantages of the Fourth Industrial Revolution

Structuring for Train, Advise, and Assist missions? The Australian Army’s Past, Present, and Future

Structuring for Train, Advise, and Assist missions? The Australian Army’s Past, Present, and Future

Australian Army Journal

Australian Army Journal

Evolving towards military innovation: AI and the Australian Army

ABSTRACT Established theory views military innovation as extraordinarily difficult, resulting in painful if infrequent revolutionary transformations. This article presents a divergent view, in which military innovation occurs progressively in an evolutionary fashion. Drawing on New Institutionalism and the Sociology of Science and Technology, we explore processes of professional debate and consensus-building among military officers, which can lead to evolutionary innovation. Examining the future application of artificial intelligence to command-and-control in the Australian Army, we find that officer attitudes to automation are rooted in shared experience of existing digitisation programmes, creating an emergent consensus over the evolutionary trajectory of future military innovation.

White Hat, Black Hat, Slouch Hat: Could Australia’s Military Cyber Capability be Deployed Under Commonwealth Call-Out Powers?

In April 2016, then Prime Minister Malcolm Turnbull confirmed the existence of Australia’s offensive cyber capability. Said to constitute both a coordinating Information Warfare Division inside the Australian Army as well as dedicated cyberoffensive capability inside the Australian Signals Directorate, the unveiling of this capability was a watershed in Australian defence policy. Yet whilst the literature has briefly examined whether Australia’s cyberoffensive capability is congruous with international law, no such analysis under Australia’s domestic laws has been undertaken. This paper seeks to partially address this gap in the research by focusing on whether the Australian Defence Force could legally launch cyberattacks against domestic targets under Commonwealth call-out powers.

Invert Syrup, Feminist Snap: Anzac Biscuits and Feminist Resistance to Imperial Logics

Baked for Anzac Day in April but eaten all year, Anzac biscuits memorialize the Australian and New Zealand Army Corps (ANZAC) participation in the Gallipoli Campaign during World War I. The chemical and culinary capacities of one of the biscuit’s key ingredients, golden syrup, offer strategies for figuring snaps, breaks, and refusals. Golden syrup catalyzes a feminist digestion of a food often perceived as culturally conservative or nationalistic. Sara Ahmed describes “feminist snap” as a moment of fury that confronts and changes history. Snap can additionally refer to crispy batter-based desserts that often call for golden syrup. Classified as an “invert syrup,” golden syrup was formulated from sugar refining waste products that were fed to pigs before being adapted for human consumption. “Invert” refers to the assessment of syrups using a beam of light, which inverts its angle of rotation as fructose and glucose separate. Reading the chemistry of inverting sugar alongside the feminist-led “anti-Anzac” day movement of the 1980s, this paper proposes that edible everyday militarisms might be snapped, inverted, spun, and reshaped. Anzac biscuits bring domestic everyday militarisms into Australian and Aotearoa New Zealand kitchens.

Trooping the (School) Colour

Trooping the (School) Colour

A Single Imperial Army? The Development of Australian Army Staff Training in an Imperial Context, 1919–1939

This article examines the development of Australian staff training across the interwar period. Focussing on the establishment of the Australian Command and Staff School in Sydney in 1938, this article argues that whilst still relying on British educational institutions, the Australian Army developed its own progressive form of officer education which reflected British and Dominion educational lessons from the First World War. By doing so, this article challenges our understanding of the interconnectivity of imperial forces and proposes a more nuanced, networked approach to officer training across the interwar period accounting for local defence priorities and national policies.

Impact of a 5-Week Individualised Training Program on Physical Performance and Measures Associated with Musculoskeletal Injury Risk in Army Personnel: A Pilot Study

To examine the feasibility and effect of an individualised and force-plate guided training program on physical performance and musculoskeletal injury risk factors in army personnel. Pre-post, randomised control. Fourteen male and five female Australian Army soldiers were randomised into two groups and performed 5-weeks of physical training. The control group (n = 9) completed standard, group-designed, physical training whilst the experimental group (n = 8) completed an individualised training program. Physical (push-ups, multi-stage fitness test, three repetition maximum (3RM) for squat, strict press, deadlift and floor press), occupational (weight-loaded march time), and technological assessments (two-leg and one-leg countermovement jumps (CMJ), one-leg balance, one-arm plank) were conducted prior to and following the training period. Comparisons between groups and changes within groups were conducted via Mann-Whitney U tests. Compared to the control group, the experimental group exhibited a significantly smaller improvement for weight-loaded march time (-0.7% ± 4.0% vs. -5.1% ± 3.0%, p = 0.03) and a greater improvement for deadlift-3RM (20.6% ± 11.9% vs. 8.4% ± 6.8%, p = 0.056). All other outcomes were similar between groups. Visually favourable alterations in the two-leg CMJ profile with no reports of injuries were noted for the experimental group. Individualised physical training was feasible within an army setting and, for the most part, produced similar physical, occupational and technological performances to that of standard, group-designed physical training. These preliminary results provide a foundation for future research to expand upon and clarify the benefits of individualised training programs on long-term physical performance and injury risk/incidence in active combat army personnel.

Reliability of Force Plate Metrics During Standard Jump, Balance, and Plank Assessments in Military Personnel.

Prevention of musculoskeletal injury is vital to the readiness, performance, and health of military personnel with the use of specialized systems (e.g., force plates) to assess risk and/or physical performance of interest. This study aimed to identify the reliability of one specialized system during standard assessments in military personnel. Sixty-two male and ten female Australian Army soldiers performed a two-leg countermovement jump (CMJ), one-leg CMJ, one-leg balance, and one-arm plank assessments using a Sparta Science force plate system across three testing sessions. Sparta Science (e.g., total Sparta, balance and plank scores, jump height, and injury risk) and biomechanical (e.g., average eccentric rate of contraction, average concentric force, and sway velocity) variables were recorded for all sessions. Mean ± SD, intraclass correlation coefficients (ICCs), coefficient of variation, and bias and limits of agreement were calculated for all variables. Mean results were similar between sessions 2 and 3 (P > .05). The relative reliability for the Sparta Science (ICC = 0.28-0.91) and biomechanical variables (ICC = 0.03-0.85) was poor to excellent. The mean absolute reliability (coefficient of variation) for Sparta Science variables was similar to or lower than that of the biomechanical variables during the CMJ (1-10% vs. 3-7%), one-leg balance (4-6% vs. 9-14%), and one-arm plank (5-7% vs. 12-17%) assessments. The mean bias for most variables was small (<5% of the mean), while the limits of agreement varied with most unacceptable (±6-87% of the mean). The reliability of most Sparta Science and biomechanical variables during standard assessments was moderate to good. The typical variability in metrics documented will assist practitioners with the use of emerging technology to monitor and assess injury risk and/or training interventions in military personnel.

Good Soldiering and Re-Virtuing Military Ethics Training

Abstract With warfare’s increasing complexity and damage from ethical failures, it is critical for defence forces to develop best practice training in military ethics. As the Australian Army’s Good Soldiering program suggests, soldiers require technical but also ethical competence. But how are ethical behaviours and the virtues they depend on cultivated in soldiers and how can chaplains contribute as public theologians? Military ethics education includes teaching just war principles of Laws of Armed Conflict, as well as understanding illegal orders and command responsibility. But ultimately ethical behaviour, following Aristotle, is grounded in character development and best informed by a revival of virtue ethics. Case studies are a training format which cultivate virtues and their application. Military ethics training at its best is virtue-based and practiced with simulated dilemmas in order to equip soldiers to act justly and exercise ‘good soldiering’ in the home, barracks, field and operations.

A military fleet mix problem for high-valued defense assets: A simulation-based optimization approach

The military fleet mix problem is traditionally used when several modernization operations are required to transition a force from an outdated fleet to a more modern one over a planning period. The main objective of such a transition is to enhance the capability of a military fleet to deploy its forces for missions at any moment by continually improving its operational readiness with minimum cost and time. The complexity of the problem is significantly increased with the increase in the number of assets to be modernized, sub-divisions (Brigades) and the length of the planning period. In this paper, to effectively address the fleet mix problem in the military context, a simulation–optimization approach is introduced with the aim of providing decision-makers with a fleet modernization schedule that enables the military to achieve maximum deployment of its available assets/forces while minimizing the total cost and full deployment time. The proposed approach uses a combination of (1) an enhanced genetic algorithm (GA) to generate initial solutions, explore and exploit the generated solutions till achieving the optimal one, and (2) a capability simulation model to evaluate each solution and determine its quality. Furthermore, the proposed GA comprises several enhanced components to further improve its performance and hence find the optimal solution in lesser computational time. (a) A heuristic repairing method, to provide feasible solutions through repairing a certain number of solutions from the initial population which can significantly guide GA search towards (near-)optimal solutions, (b) a new solution representation, that better represents the fleet schedule decision variables and characteristics, (c) improved designs of crossover and mutations, that can help GA to reach optimum solutions in a faster manner, and (d) new sorting and selection functions, that use many objectives values to allow the better solutions to survive through generations, are all examples of such enhanced GA’s components. The proposed approach has been validated by solving a case study that addresses recent fleet modernization strategies of the Australian Army to recapitalize its forces over the next decade and in a continual process. Two scenarios of the case study with different scales have been used. The experimental results show that the proposed approach can effectively provide efficient modernization fleet schedules for both scenarios which allow the maximum deployment with the minimum cost and time. Compared with traditional GA and Differential Evolution (DE), the proposed approach yields 2.37% and 7.17% more deployability, and 99.59% and 98.81% less total cost than DE and GA, respectively. A surrogate model is also presented to replace the computationally expensive simulation model for fitness evaluation. The results show that the surrogate model can significantly reduce the computational time but its accuracy for expecting the optimal objectives still need more enhancements.

A Comprehensive Analysis of Injuries During Army Basic Military Training.

The injury definitions and surveillance methods commonly used in Army basic military training (BMT) research may underestimate the extent of injury. This study therefore aims to obtain a comprehensive understanding of injuries sustained during BMT by employing recording methods to capture all physical complaints. Six hundred and forty-six recruits were assessed over the 12-week Australian Army BMT course. Throughout BMT injury, data were recorded via (1) physiotherapy reports following recruit consultation, (2) a member of the research team (third party) present at physical training sessions, and (3) recruit daily self-reports. Two hundred and thirty-five recruits had ≥1 incident injury recorded by physiotherapists, 365 recruits had ≥1 incident injury recorded by the third party, and 542 recruits reported ≥1 injury-related problems via the self-reported health questionnaire. Six hundred twenty-one, six hundred eighty-seven, and two thousand nine hundred sixty-four incident injuries were recorded from a total of 997 physiotherapy reports, 1,937 third-party reports, and 13,181 self-reported injury-related problems, respectively. The lower extremity was the most commonly injured general body region as indicated by all three recording methods. Overuse accounted for 79% and 76% of documented incident injuries from physiotherapists and the third party, respectively. This study highlights that injury recording methods impact injury reporting during BMT. The present findings suggest that traditional injury surveillance methods, which rely on medical encounters, underestimate the injury profile during BMT. Considering accurate injury surveillance is fundamental in the sequence of injury prevention, implementing additional injury recording methods during BMT may thus improve injury surveillance and better inform training modifications and injury prevention programs.

Quantification of Recruit Training Demands and Subjective Wellbeing during Basic Military Training.

Purpose: Assess and describe the physical demands and changes in subjective wellbeing of recruits completing the 12 week Australian Army Basic Military Training (BMT) course. Methods: Thirty-five recruits (24.8 ± 6.8 y; 177.4 ± 10.1 cm, 75.6 ± 14.7 kg) consented to daily activity monitoring and weekly measures of subjective wellbeing (Multi-component Training Distress Scale, MTDS). The physical demands of training were assessed via wrist worn activity monitors (Actigraph GT9X accelerometer). Physical fitness changes were assessed by push-ups, sit-ups and multi-stage shuttle run in weeks 2 and 8. Results: All objective and subjective measures significantly changed (p < 0.05) across the 12 week BMT course. In parallel, there was a significant improvement in measures of physical fitness from weeks 2 to 8 (p < 0.001). The greatest disturbance to subjective wellbeing occurred during week 10, which was a period of field training. Weeks 6 and 12 provided opportunities for recovery as reflected by improved wellbeing. Conclusions: The physical demands of training varied across the Australian Army 12 week BMT course and reflected the intended periodization of workload and recovery. Physical fitness improved from week 2 to 8, indicating a positive training response to BMT. Consistent with findings in sport, wellbeing measures were sensitive to fluctuations in training stress and appear to have utility for individual management of personnel in the military training environment.