The United States Air Force (or USAF) was a branch of the military of the United States of America.
While flying low over Siberia in 2002, USAF pilot Andrew Jenkins and his crew became out-of-synch with time. The effect wore off, but chronic radiation was detected from them before they were fully realigned temporally. (PROSE: Time Zero)
Doctor Shepherd, a USAF medical officer, was called by Ishem to investigate a Silent in a dwarf star alloy cell. He was fascinated by it but turned away, forgot what he had seen, and then asked Ishem why he had been called there. (TV: Day of the Moon)