My theories in order of most likely to least likely....
1.) This is a psyop campaign to convince our enemies that we possess greater technology than we actually possess.
2.) We do possess this new technology and we are testing it out against our own personnel. (One hand doesn’t know what the other hand is doing)
3.) All of the pilots are wrong and aren’t seeing what they think they are seeing.
4.) A foreign government possesses this new technology and is harassing our military assets with it.
5.) Aliens
And, perhaps, they (the military) are going public with this stuff despite the fact that they don't have a clue because it is happening so often that the story is bound to get out anyway.
You forgot the most likely...it's a psyop put together by the deep state so the dems can say Trump is not doing anything to protect us from the real aliens-"little green men".
You forgot number 6. God has returned.