Marine

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''This is about the marines that appear in Doom 3. For the marine that the player controls, see Doom's protagonist''

In Doom 3, the player may occasionally come across friendly Marines. Marines are usually equipped with a Machine Gun, combat helmet and body armor, but are less skilled (an less lucky)than the player. Marines are never seen in active combat during gameplay other than in multiplayer. However, during a cutscene the marines of Bravo Team are seen being ambushed and killed by a group of Wraiths.They are also seen on camera views and heard over the radio trying to defend their positions and fight off the Demons.

Background, storyline, gameplay, etc.
The Marines, based in Mars City, are Commanded by Master Sargeant Thomas Kelly. They are responsible for security and defense at the UAC facilities on Mars. Marine HQ is a hub of activity for the Marines, Mars City Security, Maintenance personnel, and the Science Team, as well as being one of the main air and space traffic control centers for Mars City. Marines (and Mars-Secs) are stationed and/or patroling throughout the base, in and around areas including Enpro, Delta Labs, the Monorail, and Alpha Labs.

Marine Characters
R. Cooper

Sargeant Kelly (Master Sargeant Thomas Kelly, Commanding Officer)

K. Miller

M. Marak

S. Holmes

D. Morton

S.L. Medley

K. Lee-Creel

E. Grafton

T. Washington

J. Yezback (Mars City Security)

T. Brooks (Mars City Security)

M. Ryan (Mars City Security)

Bill Tyson

Marine and Mars-Sec Teams
Bravo Team

Fire Team 2

Fire Team 4

Recon Zulu (Earth Fleet, first unit to enter and scout the UAC base. Found and rescued the sole survivor, a Marine)

Weapons, Vehicles, Technology, etc.
Phantom Class Dropship (UAC standard transport)

Machine Gun

Pistol

Shotgun

Sentry Bot

Automated Turrets

Trivia
There are Doom 3 mods that enable the player to have marines on their side and help fight the Demonic forces.

Links
Allied Marine Squamates: A popular AI ally mod for Doom 3. Adds characters such as Cambell and Sargeant Kelly, as well as more minor characters such as Bravo Team, Fire Teams 2 an 4, and Recon Zulu as functional AI units.Those and others are also included as "follower" that the player can lead, rather than standing in place and talking, like usual.