"Whatever you do, don't fall asleep." - A Nightmare on Elm Street (1984)
It was shot by the folks at Haunted Earth at a World War II airfield. They are obviously using night vision technology in this footage.
We are more accustomed to seeing these little balls of light in a more luminous state, so we had to get past the murkiness of this film. Once done and after careful review we found that the object behaved as though it was responding to the man's voice. This respondent quality is said to be one of the characteristics of orbs along with their peculiar motion as they are able to change direction
quickly, defying gravity. That is exactly what happens here. This motion, along with the lack of light to cause reflection is what lends this one credibility. It can't be an insect and it looks way too large to be dust.
The fine folks at Haunted Earth believe this was a paranormal event. Our only problem is that the lighting is so dim, it looks like it could be some other man-made illusion, at least until the end when it changes direction and flies past the camera.
All we can do is present this video so you can see for yourself.