User blog comment:Arbington/ME3 Theories/@comment-2169536-20100715034303

I believe in Mass Effect 3 that you`ll have to build an army in addition to having a squad made up of old and new squadmates. Here are my guesses for the army.(Note:MY GUESSES, not facts) Aliance- Already joins Shepard`s army no matter what, likely in                the beginning of Mass Effect 3. Cerberus- Joins Shepard`s army if Shepard preserves the Collector base. Rachni- Joins Shepard`s army if you spare the Rachni Queen in             Mass Effect 1. Clan Urdnot- Joins Shepard if Wrex survives Mass Effect 1 or if you kill the Thrasher Maw in Mass Effect 2. Colony of Feroes- Joins if you save the colony in Mass Effect 1 and if you help Shiala in Mass Effect 2. The "True" Geth- Joins if you complete Legion`s loyalty mission and/or if                          you tell the quarians not to fight the geth in                           Mass Effect 2. The "Heretic" Geth- Joins if you don`t complete Legion`s loyalty mission and/or tell the quarians to fight the geth in                               Mass Effect 1. Special Task Force- Joins if you complete Mordin`s loyalty mission and Mordin survives the suicide mission in                                Mass Effect 2. Keepers(Suprise Twist)- Turns out to be extremely important for the final battle and (suprise!) turns out they created the Reapers. Joins the army no matter what.