Tank Destroyer Battalion (United States) - Organization

Organization

Three initial organizations were laid down in December 1941; two were light organisations equipped solely with 37mm guns, and were abandoned as soon as possible to standardise on the third type, modeled after the 893rd Tank Destroyer Battalion, and officially declared the standard organization with the publication of FM 18-5 in June 1942. This was designated the "tank destroyer battalion, heavy, self-propelled", and consisted of a headquarters company, a reconnaissance company (including a pioneer platoon), and three tank destroyer companies of twelve vehicles each; these three companies each had one platoon of 37mm self-propelled guns and two platoons of 75mm self-propelled guns. Each platoon had two sections of two guns each, an anti-aircraft section of two self-propelled 37mm guns, and a "security section" of twelve infantrymen. This gave a total of twenty-four 75mm guns, twelve 37mm guns, eighteen anti-aircraft guns, and 108 security troops. The vehicles used were the M3 GMC, with a 75mm gun, and the M6 GMC, a 3/4 ton truck with a 37 mm gun mounted in the rear compartment.

The battalions deployed to North Africa used this organization, with both heavy and light anti-tank guns, but as reports from Europe indicated that light anti-tank guns were no longer playing a significant role in combat, the light platoons were converted to a third "heavy" 75mm gun platoon under a new organization issued in November 1942. As M10 tank destroyers came into use, with a 3-inch gun, these replaced the 75mm gun-equipped M3s.

By 1943, the role of tank destroyer battalions was becoming better understood, and the early ideas of mass employment of tank destroyer units had become obsolete. As a result, the number of battalions planned was steadily reduced, and the manpower and equipment assigned to them was reduced. A new table of organization produced in January 1943 reduced the overall manpower by 25%, by eliminating the anti-aircraft units (which had proven unnecessary), reducing the numbers of supporting units, and combining the platoon headquarters with the security section. There was no reduction in actual combat strength.

In early 1943, stemming from problems found in North Africa, the Army began to consider a more defensive role for tank destroyer units. After trials in January, fifteen battalions were ordered to convert to towed guns on 31 March, and shortly thereafter it was decided that half of all tank destroyer units would convert to a towed organization. The broad outline of the battalion remained – three companies of three platoons of four guns – but the reconnaissance company was downgraded to two platoons in the headquarters company. However, the need for larger gun crews and more security troops meant that the manpower of the unit increased again. These units were equipped with 3-inch M5 guns towed by trucks or M3 Halftracks. However, combat experience in Normandy and Italy – coupled with the fact that purpose-built M18 and M36 tank destroyers were becoming available – showed that the towed units were underperforming compared with self-propelled ones. After the Ardennes campaign, where 85% of all tank destroyer losses were towed guns, it was decided to convert all towed units back to self-propelled guns.