US says UFO sightings likely secret military tests

No. Such info would be "compartmentalized." In fact one means that one program might test something is by exposing it to another program. Like a new stealth drone might go fly around an aircraft carrier for a bit and see if the Navy spots it.

I dont even know one of my neighbor's new live-in gf name how the heck would all of the military know what all of the military is up too?

There are other sources for UFO sightings so they can't know if they were responsible. For example, sometimes it's aliens and not the US government, but that's a lot more rare.

Most of the sightings were just people saying that saw a thing. They can't know for certain what they saw. They weren't there.

Like, even if they know there was a test in the right area at the right time, the witness could easily be looking the other way and not remember which direction they were facing. How often do you know which way it's North?

Picture it as a conversation.

"I saw something round flying around all weird in the sky last night".

"Well, we were doing tests on a weird round flying thing yesterday, so it was probably that"

They can't give a more definitive answer. For all they know the person was drunk and saw a bat.