The Munitions Locker is a small storage room aboard the flagship G.F.S. Valhalla in Metroid Prime 3: Corruption. Upon entering this room, a dead Federation Marine can be seen turning to dust right in front of the door. Another Marine can be seen on the floor. Scanning this Marine will state that his attacker came through a wall, which means his attacker was most likely a Phazon Metroid.