[3] During his career Killey attained the rating of command pilot and flew more than 6,500 hours.

[4] From May 1967 to February 1968, Killey flew 129 combat missions as an F-4 fighter pilot in Southeast Asia during the Vietnam War, assigned to the 8th Tactical Fighter Wing at Ubon Royal Thai Air Force Base, Thailand.

[5] He left active duty in 1969 and joined the South Dakota Air National Guard in 1970.

He served until November 1988, when he was appointed Director of the Air National Guard and promoted to major general.

He was also active in business, including a position on the advisory board of Previstar, Inc.[10] In 2009 the new First Air Force and Continental NORAD Region headquarters was dedicated as the Killey Center for Homeland Operations.