[3] He began his military career in June 1953 with a commission as a second lieutenant in the United States Air Force through the Reserve Officer Training Corps program.

[1] After graduation from Air Command and Staff College and a receiving a master's degree in public administration from 1964 from The George Washington University, he was assigned to the 337th Fighter Group, Portland International Airport, Oregon, flying F-102 Delta Daggers.

The following year, Gregory was stationed at Davis-Monthan Air Force Base, Arizona, flying F-4C Phantom II's with the 4454th Combat Crew Training Squadron.

[1] In May 1966 he was assigned to the 53rd Tactical Fighter Squadron, Bitburg Air Base, West Germany, as an F-4D Phantom II flight commander.

[1] In September 1969, Gregory transferred to the 13th Tactical Fighter Squadron, Udorn Royal Thai Air Force Base, Thailand, where he served first as operations officer, and then became commander of the F-4D Phantom II combat unit.

[1] From November 1970 to August 1973 he was assigned to Headquarters United States Air Force, Washington D.C., working international political military affairs for Southeast Asia, Office of the Deputy Chief of Staff for Plans and Operations.

[3] Awards earned during his career:[1] This article incorporates public domain material from Biography of General Jack I. Gregory.