Comm Command: Smack 'em
Nothing frustrates an overworked commander more than a marine. Aliens be damned - the marines are so needy! Always needing this, needing that. If they ever even bother to use the word 'please' it needs to be accompanied by a 'NEED!' and 'NOW!' and "HERE!'. No respect, none at all!
Therefore, I propose a new commander command be added: The Smack. When a marine needs his diaper changed and won't shut up about it, yet you're busy saving the day by doing things that are much more useful, you can backhand that whiny brat right in the kisser just so he knows how much you think of him.
It'd be a thing of beauty. Picture this: some rambo marine, off in the corner alone, spamming the radio for health and ammo so that he can chase more useless kills. You've been telling him to shut his little mouth all day until he learns to be a team player, but he just doesn't get it. A wayward skulk is crouching in the shadows above him, ready to strike... suddenly...
The alien knows that this will be an easy meal... it tenses it's tiny legs to spring, aaaand...
... A GIANT HAND COMES OUT OF NOWHERE! WHAM! The marine falls to the ground, stunned. The skulk, confused, walks over to the dazed marine and takes a tentative nibble. The marine, not even aware that he is being eaten, now realizes what a major pain in the butt he has been.
Okay, maybe I'm not serious. But I know many commanders that would *love* this. I know I would.