Obviously I was mistaken. They looked like Canadian markings to me and they even had a Canuck registration number although that should have been a clue that they weren't military since I'm sure Canada is like the US and does not register their aircraft with civvie tail numbers. At least we got it figured out. Now for the next question. What could they have been up to well south of the 48th parallel? Are they doing some side work for the US military?