Abstract: Adaptive self-reflection, the examination of feelings, thoughts, and behaviors with a focus on coping may lead to more resilient outcomes (Crane, Searle et al., 2019) and is suggestive of negatively impacting death by suicide (Liang et al., 2020). The U.S. Army (USA) does not teach adaptive self-reflection, and this study explored the lived experiences of Master Resilience Training (MRT) trainers assigned to the 416th Theater Engineer Command, U.S. Army Reserve who were taught and used an author-created pocket-portable four-step “Mental Resilience Tool” aimed at supporting adaptive self-reflection through a novel three-question reflection process. Transcendental phenomenology was used to analyze semi-structured interviews and revealed eleven common themes: All participants found: the tool useful, the first step, titled “Stress Check” provided helpful stress information, the second step, titled “Opt-Out of Stress,” supported stress reduction, the third step, titled “Reflect To Cope,” supported a period of reflection and used novel reflective questions to lead to positive coping through a positive coping skill example list, the fourth step, titled “Try / Stop / Get Aid,” supported the use of a positive coping skill, allowed each participant to stop the tool, did not induce mental rumination, and did not require additional helping resources, but importantly most participants had some confusion with the reflection questions because of unclear instructions. Implications include further investigations into an adaptive self-reflection tool that could be published by the USA in the future and educated during eustress, so a soldier may reflect and select the positive coping skill, germane to their stressor.