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.
3 Federal Preemption >Supremacy Clause of the U.S. Constitution â establishes that the U.S. Constitution and federal law generally has precedence over state law. >Courts recognize three types: > Express Preemption â when the language of the federal statute reveals an express congressional intent to preempt state laws. > Field Preemption â when the federal scheme of regulation is so pervasive that Congress must have intended to leave no room for the state to supplement. > Conflict Preemption â when compliance with both federal and state law is impossible or when the state law acts as an obstacle to what Congress intended.