"Second to last, right next to mine." -When showing Dare to her pod.
"Ms. Naval intelligence, our new boss. So check your mouths, find your chairs... [forces a Sniper rifle into Romeo's hands] and get set for a combat drop!" - Buck to Romeo when Romeo asked for her name.
"Don't look at me Rookie, cover the Captain!" -Buck to Rookie if he stares at him for a few moments.
"That look may work with the chicks, but not with me." -Buck to Rookie if he stares at him for a few moments.
"Last person who looked at me like that was the Captain. And I asked her to marry me, so... don't say I didn't warn you." -Buck to Rookie if he stares at him for a few moments.
"I understand that in the Military we aren't supposed to ask, but I think I don't have to with you." -Buck to Rookie if he continues to stare at him (reference to the US Military's former "don't ask, don't tell" policy on relationships).
"Look, I'm not saying anything has to happen, but maybe later we just hold each other in our underwear or something, but now we have a job to do!" -Buck to either the Rookie or Romeo if he stares at him.
"Don't let that damn turret fire one more round!"
"This is Sparta!" -IWHBYD Skull at various points in Campaign and Firefight, a reference to both 300 and the SPARTAN-II program.
"Don't make me do something manly and impulsive." -IWHBYD Skull. This is a reference to Nathan Fillion's character Malcolm Reynolds from Firefly who insists that "Barging onto a companion's shuttle is both manly and impulsive".
"This is your 8 A.M. wake up call!"
"You know, with that helmet on... I can't tell... if you're staring at me... or not." -When stared at. IWHBYD possibly required.
"Go through 'em like a one stoplight town." -After all enemies in the area are dead.
"Thank you for the shiny, pretty gun." -If the player gives Buck a more powerful and bigger weapon
"You do know this is a better gun?" -If the player gives Buck a more powerful weapon. IWHBYD required.
"You do realise that this is a better gun?" -If the player gives Buck a more powerful weapon.
"Beats my standard issue noisemaker" -If the player gives Buck a more powerful weapon.
"Whoop-dee-doo!" -When the vehicle Buck is in is launched by an explosive. IWHBYD possibly required
"That was 800 yards with a bent scope!" -IWHBYD Skull required. When you no scope a headshot in NMPD HQ. Firefly reference.
"Hey, watch it. New vehicles don't just fall out of the sky." -IWHBYD skull possibly required. When you repeatedly roll your Warthog on Coastal Highway. Possible reference to Invasion of Halo: Reach.
"You take the turret. I haven't been able to hit anything all day." -If you replace Buck in the Warthog turret on Coastal Highway.
"You take the turret. You're better at it anyway." -If you hop in the Warthog turret on Coastal Highway.
"You know, they are more fun to fight than Elites" -referring to Brutes on NMPD HQ.