If you can't spot what's on that collar, avoid at all costs
But seriously, there are times where the proper greeting is so awkward, like seeing 2 E-8's (Male) walk right behind to a O-3 (Female) and a E-6 (Female) with a group of Navy Officers in front of them, while being 11:59 in the morning.
It feels like I'm saluting the enlisted marines and the proper greeting has to be repeated just so I can cover my ass. Awkward.