Marines are up in arms over — well — the right to bare arms. And we aren’t talking about the rifles they carry into combat. We’re talking about the pair of standard issue guns permanently attached at the shoulders. As of today Marines will wear their sleeves down all year, according to a recent order, approved last week by the Commandant of the Marine Corps. Leaders say the change promotes uniformity of appearance. Marines deploy with sleeves down so they should wear them that way at home too. Also, sleeves protect Marines from the sun and insects even in a…