Paranoid Marine

=Halo: Combat Evolved= This UNSC Marine was presumably a member of Fire Team Charlie deployed to what Captain Keyes thought was a Covenant weapons cache. In reality, the fire team was headed for a Flood Containment Facility.

This Marine was inserted into the swamp by Pelican Victor 933, along with Sergeant Johnson, Private Bisenti, Private Mendoza, and Private Jenkins. The squad rendezvoused with Captain Keyes, along with Privates Kappus and Riley, after discovering the remains of a dead Elite. After entering a large hall, the squad was ambushed and attacked by small, squidlike creatures. This Marine witnessed the death of almost his entire unit, and fled the battle.

Long after the Flood had finished their massacre of the Marines and Covenant alike, Spartan-117 came across this Marine. The soldier was a wreck, firing at anything that moved with his pistol, and hollering about "monsters." It is unknown what happened to this Marine after the Chief encountered him, though he definitely died when Installation 04 was destroyed.

=Halo 3=

A marine with an identical voice and mannerisms can be found on Earth in the Halo 3 Campaign level Floodgate. He was likely part of the large Marine force that assaulted Voi. When the Flood arrived and began infesting the city, his comrades were infected by the Flood. He killed them with his pistol before they could become combat forms. When the Master Chief and the Arbiter arrived at his location, he was huddled in a fetal position, babbling about how he had no choice but to kill them, and how the Flood "talked to him" through their infected bodies. The marine constantly points his sidearm at his temple, probably tempted to commit suicide.

Whether this marine is intended to be the same character as his counterpart from the first game is unknown, though doubtful.