Henry Fonda
The President

Walter Matthau
Prof. Groeteschele

Fritz Weaver
Col. Cascio

Larry Hagman
Buck

Frank Overton
Gen. Bogan

Edward Binns
Col. Jack Grady

Dan O'Herlihy
Brig. Gen. Warren A. Black

William Hansen
Defense Secretary Swenson

Russell Hardie
Gen. Stark

Janet Ward
Helen Grady

Dom DeLuise
TSgt. Collins

Russell Collins
Knapp

Sorrell Booke
Congressman Raskob

John Connell
Thomas

Hildy Parks
Betty Black

Dana Elcar
Foster

Louise Larabee
Mrs. Cascio

Geri Miller
Go-go Dancer (uncredited)

Charles Tyner
Jet Fighter Pilot (voice) (uncredited)

Will Wright
Bit Part (uncredited)