Might also be different branches. I was army 83-87. I know there was a training thing with FEMA where different branches were ordered to fire blank ammunition at fake civilians. Only the marine corp flat refused, turning their weapons on the officer from another branch that gave the order. From what I understand, the marines get the constitution flat drilled into their heads from day one.
On smarts: I have serious challenges with language. Was once ordered by a police officer to 'don't move' and then 'get out of the car' so quickly that my brain froze. He drug me out the car and threatened to charge me with obstruction for not getting out the car. I was completely honest when I told him I was trying to figure out which I should do. That made him think I was a smart ass. Not at all, just confused and kind of scared of getting shot.
Note to self: While driving in OH, if an officer asks you if you have any weapons or drugs in the car begin your explanation by saying something like "In a completely legal capacity, with a permit and a prescription...."