A New Reno native, Mags left the city to make something of herself in the ranks of New California's military. She initially joined the New California Republic Army to become a Ranger and become the best of the best, but she did not make the cut and got thrown in with the others who washed out. Even in the regular NCRA, she was stationed with the Misfits, who she has absolutely no faith in. Regardless of what she thinks, she doesn't tend to lead by example and places the blame squarely on her squad mates. She has become increasingly bitter of being stationed at Camp Golf, as according to her, "assignment [there] is a career ender."
Flags of Our Foul-Ups: Mags will tell the player that the squad needs to improve in the shooting range and at throwing grenades. When asked to line the squad up, there will be 3 Guns checks when talking to her of 25, 35 and 45. After finishing the firing range the player will need to talk to her again to improve their grenade skills with 3 Explosives checks of 25, 35 and 45. Talk to her again after this about the squad to complete the quest.
If the player is taking O'Hanrahan's advice and convincing the squad to work together, the player will need to convince her to work better with the squad with a Speech check (40).
If O'Hanrahan's or her own advice is followed during the quest Flags of Our Foul-Ups, and Caesar's Legion is not victorious, she is promoted to sergeant after the Second Battle of Hoover Dam, and Mags and the rest of her team are each given a commendation. Transformed from some of the NCR Army's worst soldiers to some of its best, Mags and the rest of the Misfits serve with distinction for many years.
If O'Hanrahan or Mags' advice is followed but the Courier sides with Caesar's Legion, Mags leads the Misfits in a defiant last stand as Camp Golf falls. The squad's valor is posthumously recognized by the NCR Army.
Should the Courier hack the military computers as Poindexter suggested and make the Misfits look like they have improved, or otherwise fail to make any positive impact on Mags or her team, the Misfits' poor discipline and morale leads them to break and run when the Legion attacks Camp Golf during the Battle of Hoover Dam. Those that are not killed by the Legion are caught by the NCR Army and hung from the Ranger Monument as deserters.
If the Courier goes with Razz's idea, the Misfits inflict heavy casualties on the enemy when the Legion attacks Camp Golf. Mags and the rest of her squad are decorated for valor. They each become addicted to Psycho soon after, however, and take to raiding the highways, trying to get their next fix. The NCR Army eventually catches up to them and Mags and her team are all shot for looting.
If the Courier kills President Kimball in the Legion quest Arizona Killer, donning NCR armor and talking to her will cause her to comment that the Courier is lucky to be walking around the camp after what they did to the President.
Mags is one of the only junior noncommissioned officers (rank of corporal) to appear in the game.
↑The Courier: "Tell me a little about yourself." Mags: "Not much to tell, really. I grew up in New Reno, joined up, took my shot at being a Ranger. Didn't make it, so I'm stuck with this crew of jokers." (2CMags.txt)
↑The Courier: "Why'd you join the Army?" Mags: "I guess I wanted to make something of myself, you know? Be the best of the best. I *wanted* to be a ranger, but... guess this is as close as I get." (2CMags.txt)
↑The Courier: "How come you didn't make it into the Rangers?" Mags: "Gee, I dunno, maybe because I'm saddled with the worst damn unit in the NCR Army? Think that might have something to do with it?" (2CMags.txt)
↑The Courier: "Sgt. McCredie asked me to talk to you about getting your squad in shape." Mags: "He did, huh? Well, good luck with that. You'd have an easier time teaching radroaches to march in formation." (2CMags.txt)
↑The Courier: "Well, maybe if you tried to lead by example instead of tearing them down." Mags: "[SUCCEEDED] You really think so? Hell, I guess it's worth a shot." (2CMags.txt)
↑The Courier: "Sounds like you aren't too fond of your squadmates." Mags: "Yeah. I mean, no, they're okay people, but they don't care, y'know? They don't have any ambition. No drive. They're slacking off, and that reflects badly on me." (2CMags.txt)
↑The Courier: "How'd you end up assigned to Camp Golf?" Mags: "Easy - this is where they send all the fuck-ups and people they don't want. But hey, it's not like I'm bitter or anything." The Courier: "This place doesn't seem so bad." Mags: "Please. Camp Golf is where they shuffle off anybody they don't want any more. Assignment here is a career ender." (2CMags.txt)