The Tactical Fire Fighting Truck (TFFT) is the U.S. Army replacement for the Military Adaptation of a Commercial Item (MACI) 2500L fire truck. The MACI 2500L is a commercial fire fighting vehicle adapted for tactical use. It lacks full cross country mobility, has a low reliability, insufficient water capacity, small crew capacity, and does not have a commonality of automotive parts with the rest of the Army's truck fleet. The TFFT is a modified Heavy Expanded Mobility Tactical Truck (HEMTT) M977 that provides improved mobility and reliability, a crew capacity of six, and has a reliable logistical support of parts because of the large number of HEMTTs in the Army inventory. The implementation of human factors engineering and system safety engineering during the acquisition process provided an improved and enhanced fire fighting system for the U.S Army.