Grissom
Location:	Armstrong / Milky Way Galaxy
Planet(s):	Benda Zaherux Notanban
Population:	Roughly a dozen to a hundred at any given time
Species:	Human
Affiliation:	Prothean Empire Geth Heretics Systems Alliance Republic of Rannoch Systems Coalition Tuchankan Military Confederacy Galactic Dominion Unified Galactic Republics
Technological tier:	Tier VII

Grissom is a star system in the Armstrong cluster. The system is very small, possessing only three planets, and lacks the capability to support permanent civilization due to its three planets have no terrestrial crusts: nevertheless, pirates, slavers and mercenary bands enjoyed using the region to stage their operations, due to this very reason. A small Alliance force would be dispatched to the region prior to the Skyllian Blitz to secure it against batarian attack until 2183 CE, where they were expelled from Armstrong by a geth heretic invasion force looking to establish a base there, with the geth establishing their headquarters on Notanban's moon Solcrum in preparation for this invasion. This was thwarted by the Normandy Squad however, who waged a week-long campaign and eventually kicked the geth out of the cluster, finishing the fight by eliminating their headquarters in the Grissom system: following the war, the Alliance tightened control over Grissom, turning the former geth stronghold on Solcrum into an outpost to monitor pirate activity. When the Reapers invaded in 2186 CE, the entire cluster was swiftly abandoned.

Grissom has been ignored ever since by colonization efforts, as two of its planets have no terrestrial crust, and Notanban is a gas giant.