a question about "Andrews Field" [The luggage bible, for example, began with a pretrip trip to a closet beside the carpenter's shop in the White House basement. There, on the night before each take-off, an Army master sergeant extricated two portable three-inch plywood bed boards and a five-inch horsehair mattress R and sent them via truck to the MATS (Military Air Transport Service) terminal at Andrews Field for loading. ] this passage is talking about transporting president's lugguage when he is out. does "Andrews Field" here refered to "Andrews airport" or " Andrews Air Force Base"? does the MATS located in this "Andrews Field"?