But still interesting that the Pentagon is claiming that this is a genuine UFO!We've discussed this one quite comprehensively. It's a night vision clip using a triangular iris, which converts the image of any lights in the field of view into out-of-focus triangles. In short, bokeh. The lights are stars and normal aeroplanes.
I've even posted this on the Rendlesham thread in the past, as an example of how nightscopes distort vision.
Curiously, some nightscopes have triangular iris shutters for no particular reason I can imagine. Often the user is not aware of this until they take an out-of-focus clip.