- Vietnam War
- U.S.
- M577 - command variant, carries additional radios and a generator.
- M113 - original version, V8 gasoline engine.
- M113A1 - starting in 1964, the gasoline engine was replaced with diesel engine.
- M113A2 - in 1979, further upgrades, armored fuel tanks. Four-tube smoke grenade launchers.
- M113A3 - in 1987, enhanced battlefield survival.
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