“…Psychophysiological stressors are easily found, such as sleep and resources [5] (water and food) deprivation while deployed in combat, which leads to psychological, cognitive, and physical impairment; adverse weather conditions that lead to hypothermia or acute dehydration [6], and heights of over 3500 m, which lead to hypoxic conditions [7]; and periods of high physical and psychological demands during either training or during operative missions [8,9]. To a large extent, all these highly stressful demands require an optimal psychological level, and ultimately a high level of physical performance, muscular strength, and optimal cardiovascular health through their active duty to tolerate the multiple stressors and successfully fulfil their mission [10,11].…”