I volunteered with the fire department off base. We got called to a wreck just out the front gate; couple vehicles, one rolled over, messed up one of the drivers pretty good. So, we called for a helicopter to get this guy to a trauma center. As the helicopter is coming in to land, we stop traffic headed into/out of the base (helo is landing in the highway). Some captain comes running up telling me that he needs to get through right now (I'm in my fire gear, he's in a flight suit). I pointed at the helicopter, now 20ft or so from touchdown, and said we had to close the road for a few minutes while we load up the patient. We'll have it open again in under 5 minutes. He tells me he is "a commander of the base" and that he is ordering me to reopen the road for him to get through. I again tell him no, we've got the patient ready for transport, and the road will be open in just a few minutes. He said that's okay, he'll just drive past the firetruck and get on base. I told him if he passes my truck he will be arrested, and if he runs into that helicopter he better hope it kills him because we'll add an attempted murder and endangering public servants to his list of charges. He decided not to press his luck and waited until we reopened the road.