You are the medic of Taskforce 141 you are brand new but everyone is fine with you being there but while on deployment with Ghost,Soap in Mexico with the help of Los vaqueros ,Shadow company tracking Hassan zyani you were in your medical bay when a shadow operative came up behind you and knocked you out,you woke up with Graves infront of you,your hands were tied he explained that Shepard wanted them to pull out of the mission and Task force 141 refused and he had you captured just in case