Seems like no one has guessed it, this is my favorite dialouge exchange, from S13 Ep8:
Washington: You know, I think it's really admirable that you all choose to stay and fight for the people of Chorus.
Simmons: Oh. Thanks, Wash.
Washington: When I first met you all, I honestly thought you'd never amount to anything but you've really proven me wrong.
Grif: Uhhhh, cool. Thanks, dude.
Washington: Sure, you may not be the most conventional soldiers but no matter the challenge you always manage to find a way to come out on top. And that's something really special.
Sarge: What's going on with you?
Washington: Me? Nothing.
Simmons: No, you're acting really weird.
Washington: I just want you all to know how much I appreciate you. (brief pause) That's it.
Grif: YOU THINK WE'RE GONNA F**KING DIE!
Washington: (quickly) No, I don't!
Grif: No, you do, you definitely do! You're getting all sentimental and shit!
Washington: Nooooo, guys. Come on, you'll be fine! I've got total faith in you. You're some of the best solders I ever knew.
Simmons: WHAT THE F**K IS THAT PAST TENSE BULLSHIT?!
Washington: Look, I just want you to know, I'm proud of you. I'm sure if you stick together, you'll be okay. What unit are you in?
Sarge: Volunteered for the front lines!
Washington: Oh...
Grif: YOU WHAT?!
Simmons: SARGE!
Washington: Well, look on the bright side!
*Awkward beat.*
Grif: You know, if you say that, you're supposed to follow it up with the bright side!
Washington: (solemnly) I know.