Features two actors who would play prominent roles in the Star Trek universe: David Brian who played John Gill in the original series "Patterns of Force" ('67), and William Campbell who played Trelane in "The Squire of Gothos" and also Koloth in both "The Trouble with Tribbles" ('67) and DS9 "Blood Oath" ('94).
David Brian and William Campbell also appear in The High and the Mighty.
This film's opening prologue states: "With the American Troops in England. The Spring of 1944."