The 75 mm Gun Motor Carriage M3 was a United States tank destroyer and self-propelled artillery piece of World War II. It was the most numerous tank destroyer in United States Army service during the critical battles in North Africa and the Philippines; and continued to be used in more limited numbers in Sicily, before being declared obsolete in early 1944. The GMC M3 was then used by the regimental weapons companies of Marine regiments in 1944–1945 at Saipan, Peleliu and Okinawa.