Navy Officer designator · Support
641X Administration Specialty LDO
Current service use not established
This code is listed in the directory. Inclusion alone does not confirm current service use.
A Navy officer classification, not an enlisted rating.
Overview
Administration Limited Duty Officers manage administration, manpower planning, pay and personnel functions, organizational planning, protocol, assignments, training, postal functions, and printed materials. They write technical reports and personnel evaluations, manage front office and staff operations, oversee flag secretariats, and provide administrative expertise across warfare communities.
Notes & Sources
- NOOCS Part A (Edition 96, Jul 2026) prints officer code 641X as “A Limited Duty Officer…”, paired with its Limited Duty Officer billet row (billet 6410 requiring the specialty); the row states who holds the code and which specialty the billet requires, not what duties every holder performs. See the cited block for the exact pairing text.
- Because the Navy carries no duty, training, or clearance prose at designator level, occupation-specific recommendations are not published here; a 641X officer’s duties depend on the assigned billet.
Evidence for this guidance (1 document)
- NAVPERS 15839I Vol I Part A · Billet and Officer Designator Codes (NOOCS Edition 96, Jul 2026)
[1] Part A officer designator table, block 641X, cached text line 867
Supports: Specialty definition
Source review recorded September 24, 2026.
Descriptions may be summarized for clarity. Verify all information with your branch career counselor or official military documentation before making career decisions.
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