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.
1. affording ground for presumption: presumptive evidence. 2. based on likelihood or presumption: the presumptive heir. 3. regarded as such by presumption; based on inference. 4. pertaining to the part of an embryo that, in the course of normal development, will predictably become a particular structure or region. preâ¢sumpâ²tiveâ¢ly, adv.