Under conditions of profound stress, individuals in high-risk occupations may experience an acute stress reaction (ASR). Given that ASRs may interfere with functioning, placing the team in danger, the Israel Defense Forces developed YaHaLOM training to teach service members how to manage ASRs in team members. YaHaLOM is a novel, rapid, peer-based intervention specifically designed for use in the midst of a high-stress event. In all, 904 Israeli combat soldiers participated in the study; 76% reported having received YaHaLOM, and 24% reported that they had not. In addition to measures of knowledge about managing ASRs, confidence in managing ASRs, and stigma-related attitudes toward ASRs, questions also addressed training approach, including the use of a video and instructor type. Participants who reported receiving YaHaLOM also reported more knowledge about managing an ASR, more confidence in managing an ASR, less external stigma, and more normative views of ASRs. Being trained with a video was associated with more confidence and less self-stigma than being trained without a video. Instructor type was not associated with differences in knowledge, confidence, or stigma-related attitudes. The study is limited by cross-sectional self-report data. Nevertheless, results suggest YaHaLOM may prepare soldiers to manage ASRs in team members; future studies are needed to assess intervention efficacy and to expand this research to other high-risk occupational contexts.