post exchange, PX - a commissary on a United States Army post

shop, store - a mercantile establishment for the retail sale of goods or services; "he bought it at a shop on Cape Cod"

slop chest - commissary maintained aboard merchant ships to sell merchandise to the crew

small stores - personal items sold aboard ship or at a naval base

armed forces, armed services, military, military machine, war machine - the military forces of a nation; "their military is the largest in the region"; "the military machine is the same one we faced in 1991 but now it is weaker"

snack bar, snack counter, buffet - usually inexpensive bar