|White Cuirass Command|
The 4th Sector Army was assigned to the Outer Rim Territories. The exact sector it was assigned to was Sector 4. During that time, it got a new nickname, it being the Outer Rim Sector Army. After the Clone Wars, it was taken command of by the Imperial Army, and the commander was Grand Moff Praji.
The 4th Sector Army, along with the other first six sector armies, was originally a reserve sector army, and served as a command for battle campaigns in the Mid Rim and Outer Rim. Later, it was called to the fight in the Outer Rim Sieges, along with the 13th Sector Army.
Later in the war, when the Galactic Republic was dissolved under Emperor Palpatine, it became part of the Imperial Army, under the command of Grand Moff Praji.
| 1st Army - 2nd Army - 3rd Army |
4th Army - 5th Army - 6th Army
| 7th Army - 8th Army - 9th Army |
10th Army - 11th Army - 12th Army
| 13th Army - 14th Army - 15th Army - 16th Army |
17th Army - 18th Army - 19th Army - 20th Army