Defense Health Agency. The Defense Health Agency (DHA) is a joint, integrated Combat Support Agency that enables the U.S Army, U.S Navy, and U.S Air Force medical services to provide a medically ready force and ready medical force to Combatant Commands in both peacetime and wartime.
Definition of preemption. 1a : the right of purchasing before others; especially : one given by the government to the actual settler upon a tract of public landb : the purchase of something under this right.
preÂ·sumpÂ·tion. n. 1. Behavior or attitude that is boldly arrogant or offensive; effrontery: She was offended at the stranger's presumption in speaking in such an casual manner. 2. The act of presuming or accepting something as true: the presumption of innocence of the accused. 3.