This film was shot at Hemet-Ryan Airport in southern California in November, 1980. Some of the air tankers were probably working the Panorama Fire that burned 310 homes and almost 29,000 acres. At that time the number of homes lost was considered to be extreme. Now almost 40 years later it ranks far down the list of destructive fires.
Aircraft seen in the video include C-119, S-2, PB4Y-2, B-17, and a few others. The video was posted to YouTube by Habujet.
Thanks and a tip of the hat go out to Tom. Typos or errors, report them HERE.