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.
preemptive right. n. the right of a shareholder in a corporation to have the first opportunity to purchase a new issue of stock of that corporation in proportion to the amount of stock already owned by the shareholder. (See: corporation, stock).