The United States Military Health Care System exists primarily to ensure the ready availability of medical support to U.S. Armed Forces at any level of conflict anywhere in the world. Many military medical units are therefore organized and equipped to permit their rapid deployment on short warning to relatively remote areas. They can provide life-saving services within hours and can operate almost independently in any climate, provided they have the means to evacuate patients and to receive supplies. The military mission demands that the medical personnel assigned to these units be trained in peacetime to do their jobs in wartime.