US Army, Technical Manual, TM 55-2320-272-14-1, TRANSPORTABILITY GUIDANCE TRUCKS, 5-TON, 6X6, M939-SERIES/M939A SERIES; TRUCK, CARGO, DROPSIDE, WOWN, M923, (NSN 2320-01-050-208 TRUCK, CARGO, DROPSIDE, WOWN, M923A1 (NSN 2320-01-206-4087) TRUCK, CARGO, WOWN, M924 (NSN 2320-01-047-8773) TRUCK, CARGO, WOWN, M924A1 (NSN 2320-01-205-2692) TRUCK, CARGO, DROPSIDE, WWN, M925 (NSN 2320-01-047-8769) TRUCK, CARGO, DROPSIDE, WWN, M925A1 (NSN 2320-01-206-4088) TRUCK, CARGO, WWN, M926 (NSN 2320-01-047-8772) TRUCK, CARGO, WWN, M926A1 (NSN 2320-01-205-2693) TRUCK, CARGO,