MIL-T-3977D, MILITARY SPECIFICATION: TRUCK, FIXED PLATFORM, INTERNAL COMBUSTION ENGINE POWERED, PNEUMATIC RUBBER TIRES, GENERAL SPECIFICATION FOR (31 OCT 1990) [NO S/S DOCUMENT]., This specification covers heavy duty, internal combustion engine powered, pneumatic rubber tired, fixed platform trucks for handling unpalletized loads in open areas over paved and unpaved surfaces.