Porter: Our priority is to address the cause of this incident and figure the best way to minimize the damage.
Gibbs: A man's dead. It's hard to minimize that.

Borin: I didn't just lose three fellow Marines in that blast. Gibbs I lost my Marine. Liam. He always had to be the one leading the charge. That was his style. He was strong, stubborn. God. Cocky as all hell.
Gibbs: Marine's a Marine.

Gibbs: Whaddya got?
Tony: Crabs.
Borin: We have a problem.
Gibbs: Worse than DiNozzo's crabs?

Tony: He made a run for it. Drew on him but I couldn't pull the trigger. You would have had him on the ground in two seconds flat. Taken out a leg or shot him in the ass.
Gibbs: Well. You followed your gut.

Gibbs: Look don't be a dumbass. You keep Agent Fornell in your hip pocket or you're a dead man.
Mendez: For freedom? I'd hardly be the first to die. But very well.

SecNav Porter: Agent Gibbs, with your reputation, I expected Parsa to be disposed of long before now. So, do tell me, please: what sort of help am I not providing?
Gibbs: Influence.

At least tell me, what is so important that one assignment can trump a career of rule-breaking?

Parsons

Parsons: I'll get to the bottom of this.
Morrow: There's a line in the sand, Parsons. Don't cross it.

I'm positive that NCIS is being set up. Sending you out here was not about Lieutenant McBride. It was about separating you from your team.

Parsons

Tobias: Hard to know who to trust anymore.
Gibbs: Has it ever been easy, Tobias?

Bend the line, don't break it. (Season 11, Episode 4)

Rule #14

Never, ever involve a lawyer. (Season 6, Episode 7; Gibbs is said to have other rules involving lawyers, but according to Tony, this is the "umbrella" one)

Rule #13

NCIS Quotes

Bishop: Seriously? How'd you get that?
Tony: Well, it's like Gorillas in the Midst. You'll get to understand his grunts.

Torres: When I break out the glass, maybe I can rip out the bars.
Bishop: With what? Your superhuman strength?