MIL-S-49248B, MILITARY SPECIFICATION: SHELTER, ELECTRONIC EQUIPMENT, S-639/G AND S-640/G (12 FEB 1987) [NO S/S DOCUMENT]., This specification covers the following: (i) Shelter, Electronics Equipment S-639/G is a mobile assemblage house in a modified S-280()/G shelter equipped with work benches, storage cabinets and racks, lighting, air conditioning, and power to form an electronic repair shop for the maintenance of electronic equipment. It is cable of being transported by railroad, military truck, and airlift; and (ii) ) Shelter, Electronics Equipment S-639/G is a mobile assemblage house in a modified S-640()/G shelter equipped with storage cabinets and racks, lighting, exhaust blowers, and dehumidifier to form an storage shelter to support the repair shop assemblage. It is cable of being transported by railroad, military truck, and airlift.