MIL-PRF-13714E, DETAIL SPECIFICATION: TRAILER, UTILITY, CABLE REEL, 3.5 TON, M31 (31 OCT 1996) [SUPERSEDED BY MIL-DTL-13714F] [SUPERSEDING MIL-T-13714D]., This specification covers one type of trailer for use as a tactical military vehicle under extreme or unusual conditions of climate, weather, terrain, and military service.