The M577A3 included the RISE powerpack with more powerful engine installation and larger, diesel-fueled generator unit. Older M577 vehicles were then upgraded to the new A2 standard. The M577A2 was nothing more than an M577 vehicle built upon the chassis of the new M113A2 APC. The switch to a diesel engine created the M577A1 designation during the 1960s. Original gasoline-fueled production models were designated as M577. Another 674 vehicles arrived from manufacture spanning November 1963 into 1964. 270 M577 vehicles were produced by FMC Corporation from December of 1962 into May of 1963. The M577 was ordered into production even before the Army had received its first pilot vehicle. The vehicle lacked the commander's seat as well as his cupola. There was support for an optional, attachable tent system that could be erected at the rear of the vehicle for an expanded headquarters-type area. The M577 included many changes to the base M113 model for the command post role such as a raised hull roof (25.25 inches), expanded communications suite, twin 60-gallon fuel tanks, a portable 28-volt generator, integrated cabin heater, folding table, and a 10-meter antenna mast. The M1068 SICPS (Standard Integrated Command Post System) became a further modification of the M577 Tactical Operations Center (TOC) vehicle which, itself, was born from the M113 Armored Personnel Carrier.
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