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An important adjunct to the armored formations was the Tank Destroyer Force. The example of the awesome power of the German Blitzkrieg in 1940 resulted in the creation of separate antitank battalions within the US infantry Division in 1940. In 1941, General McNair decided that the ideal method of countering massed armored formations would be to deploy a highly mobile reserve of antitank guns, grouped at the corps or army level. As a result, the antitank battalions were removed from their divisions and, in an effort to foster an aggressive image of their role, were renamed tank destroyer (TD) battalions.

The first TD battalions were all self-propelled, a collection of 37mm armed weapons carriers (the M-6 Fargo) and old French 75mm field guns mounted on half-tracks (the M-3 Gun Motor Carriage). Following the Tunisian campaign a number of TD battalions were converted from SP to towed guns. This was a deliberate imitation of German practice. Unfortunately, it was not realized at the time that the Germans made extensive use of towed antitank weapons only because of necessity; they desired SP carriages for all of their antitank guns but had insufficient means to produce them.

By 1944 the error had been recognized. Towed guns had proven to be too heavy and immobile for efficient use in a mobile combat environment. By late 1944 many of the towed TD battalions in the ETO were being reconverted to SP guns as the weapons became available.

Tank Destroyer Battalions were all organized with three companies, each equipped with twelve guns, for a total of thirty-six in the battalion. The guns employed by the TD battalions in late 1944 included the M-5 3-inch towed gun; the M-10 3-inch Gun Motor Carriage, the M-18 76mm Gun Motor Carriage and the M-36 90mm Gun Motor Carriage. The M-10 was the first standardized self-propelled TD gun, it was lightly armored, its chassis was a variant of the standard M-4 tank and it had poor cross-country mobility and speed. By late 1944 it was being replaced by the new M-18. While still lightly armored and with a open-topped turret, its improved suspension system gave it excellent cross-country mobility and impressive speed (it was the fastest AFV in the world until the introduction of the M-1 Abrams in the 1980s). Its 76mm gun was an improved long-barreled design that had greater hitting power than the 3-inch gun. The M-36, which was deployed in July 1944, was the most powerful antitank weapon in the US arsenal. Experience with heavy German armor had showed that the 75mm, 3-inch and 76mm series of weapons had insufficient penetrating capability. The M-36 was a stopgap measure. It was a marriage of the M-10 chassis with the powerful 90mm gun. With the newly developed high-velocity armor-piercing (HVAP) round, the 90mm was easily capable of defeating current German armor, if it could off the first hit. Unfortunately, there were few of these weapons available in late 1944.

Like the mass employment of separate armor battalions, the deployment of the tank destroyers in mass to defeat enemy armored attacks was never actually practiced. Fifty-six TD battalion eventually served in the ETO. However, a number were inactivated so as to provide personnel for infantry replacements, and others served in other roles. In the Ardennes campaign the Third Army deployed one TD battalion as an augmentation to the army’s Military Police force. One TD battalion was normally assigned to each division: SP battalions were always assigned to armored divisions, while infantry division might have either a SP or a towed battalion attached.