Friendly fire

Guys in military outfits (mainly Navy type sailor suits but blue instead of white) Some of them are in army style khakis. They must have been planning some kind of attack, because I am with a group (police force?) that ambushes them. They are all carrying machine guns shaped like WWII cannons. But none of the men try to fire their weapons. Instead, they run away. But some of them run towards and right past us. Then I am chasing several Navy bad guys down a street and pass a bar. I see several real Navy guys looking out the window. Suddenly my perspective shifts to inside the bar, where several other Navy guys are leaving through the back patio. Some other army type guys yells to stop them. I know they are innocent, but do nothing.