Background. Erosion of the stomach and duodenum is a common finding in endoscopic examination. The frequency of gastroduodenal erosion in the presence of dyspeptic complaints in conscripts is 16.4% (95% CI 10.7–24.2), and in military servicemen – 13.8% (95% CI 10.0–18.8). Objective – to assess the course of gastroduodenal erosion in military personnel during military service. Materials and methods. The object of the study was 34 people aged 18–26 from military service personnel of one of the garrisons of military units of the Air Force and Air Defense Forces with symptoms of dyspepsia and gastroduodenal erosion, who underwent dynamic observation with endoscopic control, morphological examination of the gastric mucosa and an additional laboratory and instrumental examination for recurrence of dyspepsia within 6-18 months. Results. During the dynamic observation of 34 patients with gastroduodenal erosion in 7 of them (20.6%; 95% CI 10.4–36.8) other diseases were identified or developed: in 2 (5.9%; 95% CI 1.6–19.1) – those associated with the main one (ulcer of the duodenal bulb), in 5 (14.7%; 95% CI 6.5–30.1) – those not associated with the underlying disease (chronic hepatitis 3, adaptation disorder 2). Conclusions. During the dynamic observation of military personnel with gastroduodenal erosion during the period of military service (from 6 to 18 months) without taking into account the results of eradication of Helicobacter pylori infection, recurrence of erosion occurred in 2 military servicemen (5.9%; 95% CI 1.6–19.1), a duodenal ulcer in 2 (5.9%), 5 (14.7%) developed or were diagnosed with diseases that were not associated with the upper gastrointestinal tract, affecting the quality and completion of military service.