Air sac is an anatomical term with several meanings:
Pulmonary alveolus, informally known as an air sac, one of innumerable spherical outcroppings of the respiratory bronchioles in the mammalian lung, the primary sites of gas exchange with the blood
an anatomical structure continuous with the trachea found in some insects which can be used to actively pump air throughout the body
an anatomical structure unique to the dinosaur [1] and bird respiratory system that allows unidirectional flow of air into the lungs and through the body
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Air Force Secretary Stuart Symington chose to locate the Air Force's crucial long-range atomic strike force at Offutt primarily because the base was centrally located on the North American continent, placing it well beyond the existing range of potentially hostile bombers or missiles.
SACs first bombers were primarily World War II B-29s, with the B-50 and B-36 arriving in the SAC inventory during 1948 and 1949.
SAC alerts were 24-hour, with precise requirements for ever-faster takeoffs dependent on the type of scenario in test.
The Strategic Air Command or SAC (1946-1992) was the branch of the United States Air Force in charge of America's bomber-based and ballistic missile-based strategic nuclear arsenal, as well as the infrastructure necessary to support their operations (such as tanker aircraft to fuel the bombers and, until 1959, fighter escorts).
SAC's original headquarters was Bolling Field, the headquarters of the disbanded Continental Air Force, in Washington, DC.
SAC, TAC (Tactical Air Command), and MAC (Military Airlift Command) were reorganized into two commands, AMC (Air Mobility Command) and ACC (Air Combat Command).
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