Mission Over Korea - Wikipedia, the free encyclopedia
this might be the movie you are thinking of, but its about L4s and L5s...at one point they rig up bazookas on the wings to attack tanks.
this was actually done in WW2 also...with even more success.
hope this helps
and "TOWARD THE UNKNOWN" is seen once in ahwile on TCM and you wouldn't have to pay when it comes on, checck the schedule.
Its a pretty nifty movie, great filming of unusual airplanes.