MIL-S-55286E, MILITARY SPECIFICATION: SHELTER, ELECTRICAL EQUIPMENT, S-280()/G (11 OCT 1983) [NO S/S DOCUMENT]., This specification covers one type of lightweight field and mobile shelter designed for transport by cargo truck, fixed or rotary winged aircraft, by rail, ship, and landing craft, designated as Shelter, Electrical Equipment S-280( )/G (See 6.6).