The Galactic Empire: An Empire Reborn
Imperial Officers' Manual
Major Revision: 2.0 – 2008.10.31
An adaptation of the pre–Endor document and policies.
cylinders RIP cylinders
... A Major General's Rank Insignia ...

A Master-at-Arms who has proven his dedication and devotion to the benefit of the Imperial Army and Empire as a whole may be promoted to the rank of Major General (MGN) after a significant term of service. This rank is conferred personally by the Commander of the Army at his or her sole discretion...

As with the lower variant of this rank, Brigadier, the duties of the Master-at-Arms are laid out in the corresponding Army Command information.