Combat knife

The  is a melee weapon in Fallout, Fallout 2, Fallout 3, Fallout Tactics and Fallout: Brotherhood of Steel. They were also going to appear in Van Buren and it can be found in the Van Buren tech demo.

Fallout and Fallout 2
This weapon has a unique version, the "Little Jesus", used by Lil' Jesus Mordino of the Mordino crime family.

Fallout 3
The Stallona Combat Knife is made by the pre-war company SharpWit, Inc. and is a rather common melee weapon in Fallout 3. It is affected by the Melee Damage Bonus from Strength. It is one of the better low-level melee weapons, and can get around 3-4 strikes in VATS even with a reasonable number of AP and a fast swing speed outside of VATS. However it has extremely short reach, about that of an Unarmed weapon.

The combat knife itself has a single edge with a clipped point, with a serrated edge on the back. It is of the standard Bowie shape, and is really more of a utility knife than an actual weapon.

Locations

 * Combat Knives are found on random Raiders and Talon Company Mercs across the Wastelands.
 * Three combat knives may be found in the Regulators Shack.
 * The combat knife, with 10 luck, becomes an extremely potent weapon that crits almost once every 4 to 5 hits.
 * 13 Combat Knives in perfect conditions can be found in the Mobile Base Crawler's kitchen, middle deck (Broken Steel required).
 * One can be found at Flak 'N Shrapnel'sin the Rivet City Market.

Variants

 * Occam's Razor - A slightly stronger version of the Combat Knife, wielded by Talon Commander Jabsco.
 * Stabhappy - Stabhappy shares all of its stats with Occam's Razor, but has two principle differences. Firstly, the raider that holds it respawns, allowing infinite copies to be obtained. Stabhappy also deals an additional 50% damage to limbs.
 * Trench Knife (Operation: Anchorage add-on) - The Trench Knife's stats are identical to the regular Combat Knife. The only difference is a unique "knuckle-duster" skin.

Locations

 * Mardin, found on Beastlords.
 * Bunker Alpha, sold by Octavius.

Fallout: Brotherhood of Steel
A decent weapon at the beginning of Chapter 1, but once you reach Carbon Crater, it becomes very weak.

Locations

 * Carbon Town Center, purchased from Jesse.
 * Warehouse Second Floor, found in footlocker.
 * Crater Upper Level, found in footlocker.
 * Crater Upper Level, found on Raider's corpse.

Van Buren Tech Demo

 * Taken off a male Communist Insurgent that's on one of the sidewalks in the center street.

Van Buren

 * Carried by all of the NCR soldiers aboard B.O.M.B.-001.

Trivia

 * The name of the Combat Knife in the description of Fallout, Fallout 2 and Fallout Tactics could be a reference to Sylvester Stallone's role as Rambo in the First Blood series. Rambo was known for carrying a large combat knife. (The name of the company, "SharpWit"'s, double meaning also seems to point to this.)
 * The Combat Knife of Fallout 3 seems similar in appearance to the KA-BAR combat knife that is currently used by most branches of the United States Military but there are several differences. KA-BAR's are not serrated, they have a differently shaped fuller (aka: blood groove) and they have a black finish (although it could have just worn off after 200 years of abuse).

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