Squad Bravo

Squad Bravo was made of 40 Galactic Federation Marines, 39 normal Marines, 1 Missile Trooper. Squad Bravo was commanded by Captain A.C. Exeter. Squad Bravo was part of the GFMC Task Force Herakles.

Final Mission
One month prior to the events of Metroid Prime 2:Echoes, Squad Bravo was sent to track a Space Pirate Flagship, heading for the planet Aether, in the Dasha Reigon. Squad Bravo soon caught up to the Flagship, but their ship, the G.F.S. Tyr was damaged, due to a severe storm, and they lost track of the flagship. Fortunately, they landed safely in the Temple Grounds.
 * The G.F.S. Tyr was suffering heavy damage, and was virtually useless, other than for protection from the weather, and other natural threats. However, Squad Bravo had started to work on the ship, splitting into two groups, one for repairs on the ship, one for checking and fixing, or mending supplies. According to Exeter's final report, "Each Station was doing fine, no problems.". All of the sudden, a Dark Portal appeared, and a large swarm of Dark Splinters emerged.
 * There was a long fight between Squad Bravo and the Dark Splinters. In the end, however, most of the Troopers were killed, while te survivors, or the Troopers that were in the Computer Rooms, were later possessed by an unknown Ing and turned into Dark Troopers, other than the some five that managed to reach the Pirate Labs in Agon Wastes.

Missile Trooper
The Missile Trooper was turned into a Dark Missile Trooper. and became a Mini-Boss.

During Metroid Prime 2: Echoes
Samus Aran was sent, one month later, on a Search and Rescue Mission, by the Galactic Federation. She was too late, obviously. All the Troopers were either dead or possessed. Samus was still able to gather the Trooper Logs, and learn what happened. She found Exeter's final report, helping her realize what mutated the creatures she encountered.
 * In Metroid Prime 2, Squad Bravo is the main part of the beginning of Samus's Mission, then is mainly ignored, after the discovery of the Ing.