The Army & Air Force Exchange Service (Exchange) is an agency of the United States Department of Defense. Its dual missions are to provide quality merchandise and services of necessity and convenience to authorized customers at uniform low prices, and to generate reasonable earnings to supplement appropriated funds for the support of United States Army and Air Force Morale, Welfare and Recreation (MWR) programs. The Exchange is headquartered in Dallas, Texas and its Director/Chief Executive Officer is Tom Shull. The Navy operates the equivalent Navy Exchange (NEX), while the Marine Corps operates the Marine Corps Exchange (MCX) and the United States Coast Guard operates the Coast Guard Exchange (CGX).