Grafenwoehr Training Area (GTA) is a United States Army training base located near Grafenwöhr, Bavaria, Germany. At 232 km2, it is the largest NATO training facility in Europe. The base is operated by 7th Army Joint Multinational Training Command. Facilities include the Tower Barracks. The training area was established in 1907, and used to train troops for the III Royal Bavarian Corps. Undergoing a major expansion from 96 to 230 square kilometers in 1938, the base was used by the Wehrmacht to practice blitzkrieg tactics. Following World War II, the base was occupied by the United States Army. On September 2, 1960, 16 American soldiers were killed and 26 injured when an 8-inch howitzer shell crashed into them during a morning roll call. The shell had been overloaded with charge and went 41⁄2 miles beyond its target.