The enemy shot at her first, and the Geneva Conventions entitles combat medics to shoot in self-defense.
Bob, the team's weapons specialist, knows how to patch wounds.
The Actual Pacifist has avoided learning medicine, to prevent his helping the armed forces in any way.
Subverted: Alice is given a shotgun, but she can't hit the broad side of the barn with it...
Double Subverted: Because of Short Range Shotgun. When she switches to an assault rifle, she kicks ass.
Parodied: Alice dismembers and mutilates enemies left and right, but gives them advice on proper medical treatment of the injuries in a worried tone of voice.
Zig Zagged: Alice has never held a weapon in her life. When her side seems to be losing the war, she is given a shotgun and sent into the heat of battle. But she can't hit anything. Then, she switches to an assault rifle, and kicks ass. Turns out, it wasn't Alice, but rather Aerith who disguised herself as Alice to get into the heat of battle. The real Alice is nowhere to be seen... Because she is singlehandedly invading the enemy bunker.
Averted: Alice never uses a gun.
The game is a FPS, and if The Medic had no battle abilities, they would be a very boringclass to play as.
It's a Battlefield Game, where a skilled Medic is more fearsome than a Tiger Tank.
Lampshaded: "Nice shot, especially from a doctor!"
Invoked: Medics are trained in wielding and given shotguns by the high command.
Exploited: Alice's enemies shoot her to distract her from wounded soldiers. After all, if she is fighting, she is not healing.
Defied: "I will prescribe regimens for the good of my patients according to my ability and my judgment and never do harm to anyone".
Discussed: "But is our medic allowed to fight alongside us?" "Yes, if she doesn't mind losing her protection from Geneva conventions".
Conversed: "A medic destroyed our lines. They pack as much firepower as an assault class, but they also have self regeneration".
Deconstructed: Since Alice obviously broke the Hippocratic oath by killing people, she is rejected by other doctors and her former patients alike.
Reconstructed: So she goes to the army. Since she can both heal and injure, she is a valuable team member and earns the respect of her squad.