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.
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... A Brigadier's Rank Insignia ...

Once an officer of the Imperial Army reaches the rank of Brigadier (BRG), he or she is considered to have joined Imperial Army Command. As the introductory rank of a newly appointed Master-at-Arms, the rank of Brigadier is a significant and notable jump above the ranks of Brigade Commanding Officers...

The duties of the Master-at-Arms are laid out in the corresponding Army Command information.