“Started seeing these last summer...”
FPS provides security for Federal property. They are in charge of the Civilian Security contractors.
Do you live near a federal property, or have a couple of FPS moved into the area to live?
Next thing you know, they'll be everywhere.
My job had me driving all over Wisconsin, upper MI and N. Ill. I saw them always on interstate highways. There are some military posts but I didn’t see these vehicles near any of them.
They used to be part of GSA until 9/11.. You are right they are there to protect Federal property... If you live near a Federal Building, you will see them.