Barry Sullivan (Lt. General Max Gallagher) is only fourteen years older than Paul Burke (Col. Joe Gallagher).
Ironically, the character of Lt Col Bill Christy, played here by Frank Aletter, would make a recurring appearance in Gauntlet of Fire (1966), but would be played by William Windom, while Aletter would return in Angel Babe (1966), but playing a different character.