Being that I used to be an inflight photographer in the U.S. Navy, I can tell you that nothing would have appeared on any film taken at night time anyway. But if the military released the photo and it showed structure and/or showed an elliptical shaped craft with no wings or horizontal/vertical stabilizers - then no, I would not say the military was hoaxing the photo.
On the other hand, when a farmer from Orygun miraculously has the worlds only "real" flying saucer photo that happens to look exactly like a truck mirror that is also miraculously below telephone wires - then yeah, I don't believe that.
Once again;