Robert Walker Jr. as Ensign Frank Pulver

Burl Ives as Captain Morton

Walter Matthau as Doc

Tommy Sands as Bruno

Millie Perkins as Scotty

Kay Medford as Head Nurse

Larry Hagman as Billings

Peter Marshall as Carney

Joseph Marr as Dowdy

Gerald S. O'Loughlin as LaSueur

Diana Sands as Mila

Robert Matek as Stretch

Jack Nicholson as Yeoman Dolan

Al Freeman Jr. as Taru

Richard Gautier as Stefanowski

George Lindsey as Lindstrom

Sal Papa as Gabrowski

James Farentino as Insigna

James Coco as Skouras

Don Dorrell as Payne

Michael Daves as Sergeant on Plane Wing (uncredited)

James Davidson as Bookser (uncredited)

Roger Ewing as Jackson (uncredited)

Zack Foster as Schlemmer (uncredited)

Larry Merrill as Reber (uncredited)

Adam Roarke as Mechanic (uncredited)

Ronnie Rondell Jr. as Sailor (uncredited)

Buck Taylor as Mannion (uncredited)

King Calder as Governor (uncredited)