US Army, COMBAT LIFESAVER TRAINING COURSE, CLS REF, 2005, Survival Medical Manual

INTRODUCTION
History has often demonstrated that the course of battle is influenced
more by the health of the troops than by strategy or tactics. Part of
your function as a combat soldier is to recognize potentially dangerous
situations and take preventive measures. This includes taking measures
against potential health hazards as well as protecting yourself against
enemy action. As a combat lifesaver, it is easier for you to remind a
soldier in your squad or team to take preventive measures against
disease and environmental injuries than it is to treat and evacuate the
soldier later because he is too ill to perform his combat duties.