Ray, who's spent a lot of time joking around and delivering some... unusual opinions on the war, trying to cheer Walt up after someone says that you get a reputation if you shoot some civillians.
It works, but not the way that Ray seems to have intended it.
When a sotto voce comment to Gunny Wynn reveals that for the whole months-long excursion, Sixta had been deliberately playing The Neidermeyer to draw the Marine's ire away from the officers, and salvage morale by giving them an easy target to hate.
Godfather explains to his Marines all of the reasons why they cannot consider evacuating a critically wounded civilian that his Marines shot by accident, laying it out in express detail why it is an extreme risk...and then, while meeting his Marines' expressions, he turns and orders a platoon to casevac the civilian anyway.
Trombley expressing concern for Colbert after Fick and Wynn inform them that a formal investigation might get launched regarding the incident where Trombley shot the kids and camels at Colbert's go-ahead:
Trombley: Is it gonna be okay, sergeant, I mean, this... investigation?
Colbert: You'll be fine, Trombley.
Trombley: No, I mean for you, sergeant, since you gave all the orders. I... I don't care about any of this, you know? I mean, I'll be out in a couple of years. But you... sergeant, this is your career.
Colbert: ... I'll be fine.
A somewhat subtle moment: after getting a briefing on a mission that involves driving into a known ambush for little practical reason, Colbert turns to Wright and says that it'll be a short mission and not worth experiencing, so why not wait back at Headquarters? While Poke ends up preventing Wright from leaving (by arguing that Wright is the platoon's good luck charm), it's a nice moment of Colbert, once again, trying to protect the people assigned to him.
Colbert telling Fick that his leadership is the only thing he has confidence in.