Purpose This study aims to introduce a team-centric leadership training program tailored for leaders of critical action teams. It emphasizes the critical role of effective teamwork in high-stakes environments. Design/methodology/approach The authors developed a team-centric leadership training program for crew leaders of airport security teams. The training program comprised in-class teaching on the psychological foundations of teamwork and practical simulations. The training program’s effectiveness was assessed at the individual and team levels using Kirkpatrick’s evaluation model to obtain a complete evaluation of its effectiveness. First, a pre- and posttraining questionnaire recorded changes in self-efficacy, knowledge and skills about teamwork at the individual level from 62 leaders. Second, the authors assessed the transfer effects of the team-centric leadership training on self-reported team processes and team performance during a work shift of 37 crews. Findings Results indicate an improvement in the application of teamwork skills but not in self-efficacy or knowledge among crew leaders who underwent the training. Additional analysis revealed that leaders with initially high self-efficacy in teamwork experienced a reduction posttraining, whereas those with initially low levels reported an increase. Teams led by trained leaders demonstrated a higher engagement in key team processes than those led by untrained leaders. No effect has been found on team performance. Originality/value This study offers a cost-effective alternative to conventional teamwork training methods, specifically designed for high-pressure security contexts. The authors advocate for the adoption of this training model by security professionals, aiming to elevate team processes and operational efficacy in critical action teams.