Hah, woops. They are mock interview conducted by different actors (not Nathan Fillion & Co.), showing Buck talking to Dutch, Romeo, and Mickey. There's a little video that shows what goes on through each Marine's head while they're answering questions.
For example, when Dutch thinks of "bird" a Pelican shows up, when Mickey thinks of river a flyby of a river occurs, and when Romeo thinks of a flower...a rose tattooed on a girl's chest appears.