More activity on the battlefield
If any organization is in a position to notice UFO activity, it's the military. Always active, always watching the skies, the military has been taking note of unusual activity ever since the Greeks and Romans controlled the battlefield.
Recently, a former Air Force intelligence officer began speaking out about UFO encounters with the military which seem to increase during wartime. In some of those encounters, the UFOs actually interact with the battlefield, seemingly taking sides in the encounters.
During the Vietnam War, there were countless incidents of unusual lights in the skies and saucer-shaped flying craft which seemed to be observing the battlefield. One patrol boat in a river along the DMZ between North and South Vietnam reported seeing two flying saucers which floated overhead for a while, then fired a burst of light which destroyed an enemy patrol boat.
Are UFOs attracted to military activity? Or is it simply that war zones have more observers, and more people filing reports about what they observe?