Navy Officer designator · Engineering
623X Engineering/Repair 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
A submarine engineering repair limited duty officer plans, directs, and supervises the installation, operation, maintenance, and repair of non-nuclear mechanical systems. This officer manages work involving electrical and auxiliary machinery, hull structures and fittings, training programs, industrial shop production, quality assurance, computerized work control systems, reports, budgets, and technical advice.
Notes & Sources
- NOOCS Part A (Edition 96, Jul 2026) prints officer code 623X as “A Limited Duty Officer…”, paired with its Limited Duty Officer billet row (billet 6230 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 623X 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 623X, cached text line 791
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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