AR 25-59 governs the construction, approval, and use of office symbols throughout the Department of the Army and the official AAO database.
View AR 25-59 on armypubs.army.mil
AR 25-59 addresses how office symbols identify correspondence originators and denote organizational placement for historical and records purposes. It sets limits on symbol construction and specifies when symbols are approved, deactivated, or modified.
HQDA principal official agency office symbols will contain no more than nine letters. (paragraph 2-3)
Approve office symbols for Headquarters, Department of the Army (HQDA) principal official agencies their field operating agencies (FOAs), and the headquarters of Army commands (ACOMs), Army service component commands (ASCCs), and direct reporting units (DRUs). (paragraph 1-4)
Ensure approved office symbols are current and added to the AAO database. (paragraph 1-4)