I've been on base in Camp Lejeune in NC several times and I've been on base at Pensacola once. Every single time the guards checking each and every vehicle entering Camp Lejeune were armed, usually with holstered M9's but at times they had slung M4's. Pensacola entrance was like meeting the greeter at Walmart, at least at the entrance I used, which I don't recall as being the main entrance. I could never understand the difference between the two.