U.S. Half Track 81mm Mortar Carrier M21- World War Two
- United States Army
- self-propelled artillery mount on a half-track chassis
- equipped with an 81 mm M1 mortar and an air-cooled M2 Browning machine gun
- 110 were produced
- mainly served on the Western Front in Normandy, and Southern France, and then later in the Ardennes during the Battle of the Bulge.
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