[She gives a nod of agreement at the suggestion to keep her head down. That's definitely a lesson she's already learned here. This place was made more to a different scale than she's used to.]

What am I? I'm a sergeant in the space marines. Hero's Duty. I know there's a few different kinds of us out there.

[Space marines are hardly a rare element in first person shooters, she knows. And that's pretty much what she's assuming is the story with this Spartan here. So Calhoun offers the other woman a slight bow of the head in recognition of a potential similar background.]

Sergeant Calhoun at your service.