The 21st Strike Force is an all-Turian battalion in the Citadel Alliance. It consists of 20,000 different soldiers. The 21st is so big that it is one of the three main battalions used in massive combat. The XO of the 21st Strike Force is Genra Protarius. The 21st Strike Force has been in service since 2196 and has served ever since. The force has a history of bravery and valor.