Er…because he’s a frickin’ Marine in a frickin’ war zone? Just a guess.
I note that he’s far from the only armed person in that photograph. Just a quick scan shows three M4 buttstocks and another Beretta. So apparently nobody who was actually there considers the Secnav to be doing something too seriously silly.
But that’s okay, Barbara. We can just go with the more easily digested explanation, that he’s in the Trump administration and is therefore a crazy right-wing gunhugger who should die. But thanks for playing.
Honestly, I’d be a lot more concerned about bringing that POS SERPA holster into a sandy environment. Take it from me, bad choice.