You have pilots reports, supposedly the best trained observers, that:
- saw some tech they've never seen before that impressed beyond belief;
- or after all the best squadrons can be easily fooled/deceived/ by something, or even on their own with optical illusions and group pressure.
- or that are willing to lie about some event to have some fame and spotlight.
Then you have the best radar systems, jets, and overall military tech that:
- are properly tracking unidentified tech;
- have flaws and glitches, way more then we would have expected - even arrays of systems are failing/glitching all together;
- are not properly tested and fail to filter stuff that shouldn't appear;
- can be manipulated by foreign entities;
- are operated by individuals who are not properly trained to operate and interpret the information output.
What ever the scenario is, it's not good.