Navy Officer designator · IT & Cyber
681X Cryptologic Warfare 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
Cryptologic Warfare Limited Duty Officers manage information operations involving cryptology, command and control, computer network operations, space systems, signals intelligence, and signals security. They plan the use of personnel, equipment, and resources while overseeing communications, electronic maintenance, secure networks, technical research, and Communications Security Material System functions.
Notes & Sources
- NOOCS Part A (Edition 96, Jul 2026) prints officer code 681X as “A Limited Duty Officer…”, paired with its Limited Duty Officer billet row (billet 6810 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 681X 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 681X, cached text line 913
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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