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, (25), (35) and (45). After finishing the firing range the player will need to talk to her again to improve their grenade with 3 Explosives checks (25), (35) and (45). After that talk to her again 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 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 President Kimball.