My theory is that it “appears” to happen near bases. But that could just be because bases have people watching all the time. The local business, farm, or residence….not so much.
Your comment is partially valid.
The most spectacular military base case (imho) was the Loring AFB 1962 case in Maine—hundreds of witnesses—huge craft—witnesses allegedly were hypnotized and turned into “zombies” on the air field under the UFO while folks in the tower looked on in shock.
This is discussed in this book:
https://www.amazon.com/Confession-Hidden-Alien-Encounters-Revealed/dp/1695688856