The Interstellar Strike Force was a mercenary group operated by individuals belonging to the Adnerem species. These Adnerem leaders were all sterisi, meaning they were part of the same steris, which is the term used for an Adnerem family group. These Adnerem were in charge, and they recruited talented individuals from various other species to serve as the soldiers.
The initial reference to the Interstellar Strike Force occurred within the Star Wars Adventure Journal 11, specifically within the Alien Encounters articles focusing on the Adnerem species. This sourcebook, created by West End Games, was released in 1996 as an add-on for their Star Wars Roleplaying game.