Training circular 21-3 is an aid for soldiers in cold climates.
Training circular 3-97x61 details techniques Soldiers and leaders must know to cope with mountainous terrain. These techniques are the foundation upon which the mountaineer must build. This TC also discusses basic and advanced techniques to include acclimatization, illness and injury, equipment, anchors, evacuation, movement on glaciers, and training.
Training circular 90-6-1 was superseded by FM 3-97.61.