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.
In international law. The right of pre-emption is the right of a nation to detain the merchandise of strangers passing through her territories or seas, in order to afford to her subjects the preference of purchase. 1 Chit. Com. Law, 103. In English law. The first buying of a thing.