The scene opens up with Y/N in Bootcamp as currently, he was in training and was currently at an obstacle course with several other Marines.

Drill Instructor: Line up, Marines! I don't want any of you assholes to be slow!

Once they line up, they all run as they were armed with M16A3s and they jumped onto walls and scaled the tall ones as they kept moving and got into the mud pit, and under the barbed wire as two Marines opened fire with an M240B.

Y/N: Man, don't be like the random Marine in Jarhead!

One of them panicked, but Y/N pulled him down, not caring about how his arm got injured from the barbed wire. Then he kept moving as he was running towards the end of the course.

Drill Instructor: GO GO GO, RECRUITS!

After that, they were now in the firing range, opening fire with M16A3s, but Y/N got transferred to being his older brother Henry, as his Second-In-Command (2IC). Then he came back, but with an M4A1 Carbine. And he opened fire on the steel targets in Semi-Automatic.

Drill Instructor: Blackburn, good shooting. Maybe you're good enough to be your brother's Second-In-Command, eh?

Y/N: I'm born for it, sir. I've gotta follow my brother's commands. He's a Staff Sergeant, sir.

Drill Instructor: 'This the idea of how you wanted to be a Marine like your big brother? Good job, you fuck! Maybe you'll always hide by your brother every time!

Y/N: Yeah, yeah, sir. Continue your yapping while I listen.

Drill Instructor: Blah, blah, blah, you've got the job! After this, get a fucking check-up!

Y/N turned around and yelled out.

Y/N: SIR-FUCKING-YES-SIR!

After that, he was at the infirmary, where he saw a girl coming out. And it was Lilith Asami.

Lilith: Oh, you're Y/N. Right?

Y/N: Henry's little brother? Yep.

Lilith: Lilith Asami, nice to meet you.

Y/N: Likewise. Finished your check-up?

Lilith: Yep. Had to take off a cast after I broke my hand in a training accident.

Y/N: My arm's bleeding since I saved someone's ass from ending up like the guy in Jarhead.

Lilith: Who? The guy who got shot in the head with an M60?

Y/N: Correct.

Y/N entered the infirmary as he talked with the doctor.

Y/N: Mornin' Doc.

Doctor: Ah, Y/N. You must be here for a check-up, correct?

Y/N showed his bleeding left arm as evidence.

Doctor: Oh. Training injury, I suppose?

Y/N: Yep. Saved a guy from becoming one of the marines in Jarhead.

Doctor: You got a high pain tolerance?

Y/N: About like 75%.

Doctor: Henry's own pain tolerance is even higher than yours.

Y/N: Am I getting a check-up or what?

Doctor: Go and kindly sit on the chair, Blackburn Junior.

Y/N: God, that's embarrassing...

Doctor: You met Asami after she left, right?

Y/N: Yep. I did.