The Fourth Outer Rim Army, also designated as the 4th Sector Army, the White Cuirass Command, or simply the Fourth Army, was a Sector Army of the Republic, and subsequently the Imperial forces, tasked with the protection of Sector 4. Originally deployed to Sector 4 as a component of the Reserve Sector Armies, the 4th Sector Army functioned as a reserve force for Republic military operations throughout the Mid Rim and the Outer Rim Territories during the era of the Clone Wars. Towards the end of the conflict, it gained the title of the Outer Rim Sector Army, operating in conjunction with the Thirteenth Army during the Outer Rim Sieges. This army included Jedi General Ki-Adi-Mundi and the 21st Nova Corps led by clone marshal commander CC-1138, also known as Bacara. The 4th Sector Army eventually engaged in combat within its designated sector near the Clone Wars' conclusion, specifically during the battle of Neimoidia.
- " Guide to the Grand Army of the Republic " — Star Wars Insider 84
- The Essential Guide to Warfare
- The Official Star Wars Fact File Part 97 (BAC 1-2: Clone Commander Bacara)