These AFVs are a type of self-propelled gun (SPG) that focused on direct-fire tasks in World War II. However, unlike tanks, early versions had a fixed, armored superstructure rather than a turret.

The M10 Booker combat vehicle, formerly known as the Mobile Protected Firepower vehicle, is named for two soldiers, Pvt. Robert Booker, left, and Staff Sgt. Stevon Booker, right. (Courtesy of the ...