Equipped with a more powerful engine and a larger, heavier airframe than primary training aircraft, Vultee's BT-13 served an important role as a secondary-level trainer for the U.S. Army Air Corps and Navy. Designed by Vultee's Richard Palmer, the BT-13 was adapted from plans fora fighter aircraft....

This training circular details techniques Soldiers and leaders must know to cope with mountainous terrain. These techniques are the foundation upon which the mountaineer must build....