The announcer

The Announcer is the Male voice in the Halo: Combat Evolved, Halo 2, and Halo 3 Multiplayer that shouts out certain phrases when the criteria are met (like the Announcer shouting out Medal names when certain Medals are obtained and general Events in the game). It should be noted that the voice of Master Chief sounds very similar to the announcer's voice.

The Announcer is voiced by Jeff Steitzer

Medals
Multi-Kill Medals
 * Double Kill
 * Triple Kill
 * Killtacular

Spree Medals
 * Killing Spree
 * Running Riot

Events
???

Medals
Multi-Kill Medals
 * Double Kill
 * Triple Kill
 * Killtacular
 * Kill Frenzy
 * Killtrocity
 * Killimanjaro

Spree Medals
 * Killing Spree
 * Running Riot
 * Rampage
 * Berserker
 * Overkill

Events
???

Medals
Multi-Kill Medals
 * Double Kill
 * Triple Kill
 * Overkill
 * Killtacular
 * Killtrocity
 * Killimanjaro
 * Killtastrophe
 * Killapocalypse
 * Killionaire

Spree Medals
 * Killing Spree
 * Killing Frenzy
 * Running Riot
 * Rampage
 * Untouchable
 * Invincible

Weapon Spree Medals
 * Shotgun Spree
 * Open Season
 * Sword Spree
 * Slice 'N Dice
 * Sniper Spree
 * Sharpshooter
 * Splatter Spree
 * Vehicular Manslaughter

Objective Spree Medals
 * Hail to the King
 * Infection Spree
 * Mmmm Brains
 * Zombie Killing Spree
 * Hell's Janitor
 * Juggernaut Spree
 * Unstoppable

Other Medals
 * Perfection
 * Extermination
 * Killjoy
 * Last Man Standing

Events
General Gameplay
 * "Gained the lead!"
 * "Slayer!"
 * "Oddball!"
 * "King of the Hill!"
 * "Capture The Flag!"
 * "Assault!"
 * "Juggernaut!"
 * "Infection!"
 * "VIP!"

Capture The Flag
 * "Flag Taken!"
 * "Flag Dropped!"
 * "Flag Stolen!"
 * "Flag Captured!"

Assault
 * "Bomb Taken!"
 * "Bomb Dropped!"
 * "Bomb Armed!"
 * "Bomb Disarmed!"
 * "Bomb Detonated!"
 * "Bomb Reset!"

Oddball
 * "Play Ball!"
 * "Ball Taken!"
 * "Ball Dropped!"
 * "Ball Reset!"

VIP
 * "New VIP!" (unsure)
 * "VIP Killed!"

Juggernaut
 * "New Juggernaut!"
 * "Juggernaut Killed!" (unsure)

Infection
 * "New Zombie!"

King of the Hill
 * "Hill Controlled!"
 * "Hill Contested!"
 * "Hill Moved!"