Felix-001 was a SPARTAN II Commando of the UNSC Naval Special Warfare Command he was a member of Sword Team and also co-commanded the 86th Platoon, being a prominent and respected figure among his men and other units he served with. For a SPARTAN he was particularly diminished in height and also unusually sociable, trying to get to know the men who worked under him, even developing an attraction to his co-commander of the 86th, Sergeant Major Sharp.