Quotes: Unfriendly Fire

Oops, sorry sir!
Warhammer 40,000, traditional.

I've found that by-the-book commissars tend to die heroically for the Emperor, even when the enemy is suspiciously far away.

We've killed officers in blue coats, officers in red coats, even officers in white coats; because I don't care what army an officer fights for, or what colour coat he wears, or what king he serves. A bad officer is better off dead, and a good soldier had better learn how to kill him.
Sharpe lays it out to a troop of new recruits, while their officer in a white coat watches on.

"Commodore Fesler, an interesting statistic: Did you know that half of all officer deaths on the battlefield are the result of assassination by subordinates?" (gunshot)
Colonel Grand, Fullmetal Alchemist

"....Stray Bullet?"
"Stray bullet it is."
Maes Hughes and another Amestrian soldier reacting to the above, Fullmetal Alchemist

I don't even think he was aiming for me. I was just the excuse!
Gordon Freeman, Freeman's Mind, upon seeing a marine accidentally kill two of his squadmates with a grenade launcher.