N7 Special Ops
During the Reaper war, Allied forces began recruiting anyone, soldier or mercenary, to serve on the front lines of the conflict. The most experienced operatives formed squads to secure objectives, evacuate civilians, and battle Cerberus or the Reapers deep in enemy territory. Initially led by N7 Alliance marines, these squads were nicknamed the N7 Special Ops. In light of these teams' exemplary service and remarkable bravery, the Alliance allowed this unofficial name to spread across the ranks as a sign of respect for their efforts.
These soldiers are the go-anywhere, fight-anything special forces of the Alliance that were trained at the Interplanetary Combatives Academy in Rio de Janeiro, Brazil. They had to survive combat situations "in an admirable and effective fashion" to receive the N7 rank. During the Reaper invasion, many N7 marines began to train other species in anti-Reaper asymmetric warfare and joined N7 Special Ops squads in battle.
My Page on the Bioware N7 HQ