Navy Officer designator · Engineering
620X Nuclear Power 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
Nuclear Power Limited Duty Officers supervise and manage the operation, maintenance, installation, and repair of naval nuclear propulsion plants and systems. They plan and evaluate training programs, oversee quality management and assurance, prepare reports and budgets, and provide technical advice on nuclear systems.
Notes & Sources
- NOOCS Part A (Edition 96, Jul 2026) prints officer code 620X as “A Limited Duty Officer (Nuclear Power)…”, paired with its Limited Duty Officer billet row (billet 6200 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 620X officer’s duties depend on the assigned billet.
- Era note: the Edition 96 row also prints “Formerly DESIG 640X” for this designator.
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 620X, cached text line 787
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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