Campbell received a Master of Science degree in systems management from the University of Southern California in 1968, and graduated from the Industrial College of the Armed Forces at Fort Lesley J. McNair, Washington, D.C., in 1972.

In July 1959 Campbell joined the 301st Bombardment Wing at Lockbourne (now Rickenbacker) Air Force Base, Ohio, as a B-47 aircraft commander.

In July 1965 Campbell transferred to the 9th Strategic Reconnaissance Wing, Beale Air Force Base, California, where he became one of the first aircraft commanders operationally qualified in SR-71s.

He then moved to Ubon Royal Thai Air Force Base, Thailand, as deputy commander for operations, 8th Tactical Fighter Wing.

Returning from Southeast Asia in November 1973, he was assigned to the Aeronautical Systems Division at Wright-Patterson Air Force Base, Ohio, as director of development, test and evaluation, Office of the Deputy for B-1 Aircraft.

From July 1974 until October 1975, Campbell commanded the 6th Strategic Wing, Eielson Air Force Base, Alaska.