Altitude Survival for Heavy and Very Heavy Bomber Crews is published by author(s) United States. Army Air Forces. Air Force, 2nd. The Altitude Indoctrination Unit is an extremely valuable document for pilots and crews of military aerospace vehicles. The book provides detailed step-by-step instructions on how to survive at high altitude in extreme pressure conditions and prepared devices. The overall objective of the book is to increase the knowledge and skills of pilots in critical situations, helping them to remain efficient and calm in all circumstances of flying at high altitudes.