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|Operators|| United States|
|No. of positions||3|
|Position 3||12.7mm machine gun|
M21 Mortar Motor Carriage is an American self-propelled artillery.
A variant of the M3 Half-track, the M21 Mortar Motor Carriage is equipped with a 81mm M1 mortar in the rear compartment. The M2 Browning machine gun is retained, but is moved further back on a pintle mount.
As an artillery piece, the 81mm mortar does not offer very long range and is not very adequate against enemy armour, but it is still good against soft-skinned targets in relatively close support of friendly units with respectable rate of fire.