<Snipped quote by Ozerath>
Honestly, I'd assume they know eachother, but I wouldn't want to put any false ideas into your head and feed you wrong info. Might wanna PM Rockette on that, but yeah. I'd believe they know eachother solely because they've gone through shitloads of work together for one mission. Not necessarily companions, but just a trio with acknowledgement towards one another. I'd actually imagine that kind of 'professional' atmosphere with them three, but that's just me. :>
I imagine they'd know each other because the way Rockette described to us in PM suggested that they'd been at that post for a decent amount of time before that mission. And then, if nothing else, at least a professional acknowledgement of one another.