|M10 in action near Saint-Lô, June 1944|
US combined arms doctrine on the eve of World War II held that tanks should be designed to fulfill the role of supporting infantry in forcing a breakthrough, and then exploiting the breakthrough to rush into the enemy’s vulnerable rear areas.
The anti-tank warfare mission was assigned to a new branch, the Tank Destroyer Force. Tank destroyer units were meant to counter German blitzkrieg tactics.
Tank destroyer units were to be held as a reserve at the corps or army level, and were to move quickly to the site of any massed enemy tank breakthrough, maneuvering aggressively and using ambush tactics to destroy enemy tanks.