It really depends on whether or not the military personal on Destiny are special forces. I was not in special forces during my time in the Army, but I did work(and spar in the gym) with special forces several times while in Iraq, and I even visited their outpost north of us on a supply run once. At a certain level in the American armed forces all the normal customs and courtesies just go out the window. While working with SF I saw NCOs calling officers by their first names, beards all over the place, uniforms and weapons worn in all sorts of strange exotic ways. There was zero uniformity and the normal bearing and discipline of my own regular Army unit were not visible in the SF guys. So I give the folks on Destiny some leeway when it comes to the little details. They're even further away from authority and normalcy than the backwaters of Iraq's Diyala province.