Did anyone bother to ASK the cops what they were doing? I know they may be a bunch of liars, but then again, they may just tell the truth. Let's not go off half-cocked here. 

 Practice to keep down the americans that protest and object to the way the government is run, They will need a lot more than 100 cars.

JL should have chatted those military troops up.  Never know what they would like to say.