Crossfire

"Grace be with you all. Amen"

—Heinkel Wolfe

Crossfire follows the adventures of Moe/Blood Knight Yumiko Tagaki, and gun-toting Bifauxnen Heinkel Wolfe, agents of The Men in Black-style Vatican Section XIII, also known as the Iscariot Organization. In their efforts to administer divine punishment, they slash and slaughter through three chapters of bloodshed and violence.

Unlike the Hellsing Organization, Iscariot works to eliminate every threat to Catholicism. Pagans, heathens, and the like are immediately demoted to sub-human status and killed indiscriminately.

That still doesn't account for the other twelve divisions of the Vatican, one of which is Section III, Matthew. Presumably they all take their names from the disciples of Jesus Christ.

Crossfire exists as an extra in the first three Hellsing volumes, but Word of God has said that it is not part of Hellsing Canon.

Tropes used in Crossfire include:

A Day in the Limelight: Hinkel and Yumie are completely minor characters in the main Hellsing plotline.
Anime Catholicism: The basis of the entire plot.
Anti-Hero: Iscariot as a whole.
Ascended Extra: The main characters.
Ax Crazy: Yumie.
Badass Longcoat: Heinkel.
Berserk Button: Yumiko's glasses.
Black Comedy: Oh Yes!
Gray and Black Morality: Iscariot's regular massacres aren't exactly justified, but their enemies are Obviously Evil.
Comedic Sociopath: Yumie and Heinkel.
Dude Looks Like a Lady: Gloriously inverted with Heinkel, but played straight with Maxwell.
Expy: Mr. Ridgeway is a notorious example.
Guns Akimbo: Heinkel.
Conservation of Ninjutsu: Added to the Principle of Evil Marksmanship this makes for excellent Plot Armour!
Katanas Are Just Better: Yumie wields one, and those people won't miss their limbs.
Pistol Pose: The opening artwork.
Reason You Suck Speech: A staple of conversation, and used gratuitously.
Scary Shiny Glasses: Something of a visual motif for Heinkel, and Maxwell.
Slasher Smile: Yumie, in her first appearance no less!
Split Personality: Yumiko breezes between a gentle girl and Yumie, a crazed and violent zealot.
Super-Powered Evil Side: Yumie.
Thirteen Is Unlucky: Yeah, for everyone else that is.
Too Dumb to Live: The cultists, and their "Messiah".
Wunza Plot: One's an nun, one's an assassin, they kill in the name of God.