The guided missiles are U.S. Navy's KGW-1 missiles, later redesignated LTV-N-2, developed from V-1 Buzz Bombs created by the Germans in WWII. They may have been used in the manner shown in the movie for Operation Downfall, the invasion of Japan to end WWII.
In the summer of 1945, for the first time in U.S. submarine warfare, USS Barb (SS220) successfully employed rockets against the Japanese home islands. Excluding signaling devices, this very likely was the first rocket launch from a submarine.
Glenn Ford's leading lady, Swedish-born actress Viveca Lindfors, had a long and distinguished career in Hollywood. In 1948, just two years before this modest Columbia production, she co-starred with Errol Flynn as the queen of Spain in The Adventures of Don Juan.
When the remotely-controlled aircraft is being taxied, the two parked aircraft in the distance behind the control unit are Consolidated PB4Y-2 Privateers - a maritime patrol aircraft/bomber developed from the much better known B-24 Liberator.