<p>Marksmanship proficiency can be affected by various factors, including the environment, the task, as well as clothing and individual equipment (CIE). This study aimed to investigate the impact of CIE on team performance using a simulated team shooting scenario (TSS). The TSS task was designed to simulate a fireteam engaging with targets in 360-degrees. Thirty-one unique three-person teams completed the TSS while wearing one of four head-borne configurations. We investigated whether the teams showed performance differences across the test configurations. Nine marksmanship measures were aggregated to the team level and compared using statistical testing: vertical and horizontal rifle stability, trigger control, aim time, time since last shot, shot accuracy, shot group precision, probability of engagement, and probability of hit. The results showed that teams performed worse while wearing the M50 mask, the most burdensome configuration, with significantly slower fire rates and worse horizontal rifle stability compared to other equipment configurations. However, there were no statistically significant differences in accuracy or probability of hit across configurations, which is likely due to the challenging task demands. Further research is needed to comprehensively understand the dynamic relationship between CIE and fire teams. Specifically, future studies could compare CIE’s influence on individual vs. team-based marksmanship performance. Additionally, researchers should investigate the impact of CIE on other team-based tasks, such as communication or decision-making, to facilitate understanding of the effects of CIE on team performance. This knowledge can help design equipment that supports the system of warfighters who work together, rather than just the individual.</p>