The 2.5-ton (4x4) FMTV is designated as the Light Medium Tactical Vehicle (LMTV), while the 5-ton (6x6) is designated the Medium Tactical Vehicle (MTV) [REF].
In a move away from U.S. Army tradition, a Cab Over Engine (COE) design was selected for the FMTV as while the US Army did not specify this configuration, given the Cold War situation prevailing at the time it had indicated that overall length for shipboard transport was a consideration.