Yes, there was a rather extraordinary "air intruder" incident over southern California (the L.A. area) in 1942 and a lot of AA guns were fired and searchlights directed at something in the sky which was assumed to be of "Japanese" origin at the time, not surprisingly, but it was definitely not of Japanese origin nor was it of domestic origin. It's in the records. There is no confirmation to this day as to just what it was that was seen and fired upon. The reports suggest what is nowadays termed as "a UFO" by most people, but the terminology changes. They were intially called "flying disks" or "flying saucers" by most people. What you call it is usually whatever you have heard someone else call it in the media. Ultimately, it doesn't matter what you call something...its essential nature remains unchanged regardless.