Frank Alton Armstrong Jr. (May 24, 1902 – August 20, 1969) was a lieutenant general of the United States Air Force. As a brigadier general in the United States Army Air Forces during World War II, he was the inspiration for the main character in the novel and subsequent film, Twelve O'Clock High. After the war, he held a variety of senior leadership positions prior to and following the establishment of the USAF as an independent service in 1947. Promoted to major general in 1950, he advanced to lieutenant general in 1956 and retired at that rank in 1961.