Navy Enlisted Rating (Job) Descriptions

Cryptologic Technician - Maintenance (CTM)

Fleet Week in Elliott Bay, Seattle
••• Views aboard USS Bunker Hill (CG 52) Guided Missile cruiser, Seafair Celebration Parade of Ships, Fleet Week, Elliott Bay, Seattle, WA, USA. Stuart Westmorland / Getty Images

The Cryptologic Technician Maintenance branch offers a career in the installation, configuration, diagnosis, and repair of state-of-the-art electronic, computer, and network hardware and software systems.

The duties performed by CTMs include:

  • perform hardware and software isolation and repair of state-of-the-art electronic, computer and network equipment and related systems using complex test and analysis equipment, diagnostic software, hand tools and technical publications;
  • perform computer and electronic system hardware and software installation, configuration and modification;
  • analyze the configuration and monitor the operation of computer telecommunications and networking systems;
  • calibrate and repair a wide variety of precision electronic test equipment;
  • perform information security and computer network defense functions for secure networks and communication systems;
  • maintain fleet cryptologic permanent and carry-on direct support systems required in special land, sea surface and subsurface operations.

Working Environment

CTM are assigned to equipment installation activities, electronic maintenance, and computer networking system departments and divisions. They may be assigned to either day work or shift work in a large facility or one of the individual or two-person independent duty assignments at sea or ashore. Departments and divisions are usually divided into specialized maintenance shops and are normally air-conditioned, well-lighted, and completely equipped.

A-School (Job School) Information

  • Correy Station, FL -- 121 calendar days

ASVAB Score Requirement: MK + EI + GS = 156 + AR = 218 Minimum MK = 57 Minimum AR = 57

Security Clearance Requirement: Top Secret (Single Scope Background Investigation Required)

Other Requirements

  • 72-month enlistment obligation
  • Must be a U.S. Citizen
  • Immediate family members must be U.S. Citizens
  • Moral turpitude offense(s) are generally disqualifying
  • Personal security screening interview required
  • Former members of the Peace Corps are not eligible
  • Candidates must be a high school graduate or equivalent (GED, CPT, home study or other equivalency). If not a diploma graduate, applicant must provide a high school transcript verifying successful completion of the 10th grade.

Sub-Specialties Available for This Rating: Navy Enlisted Classification Codes for CTM

Current Manning Levels for This Rating: CREO Listing

Note: Advancement ( promotion ) opportunity and career progression are directly linked to a rating's manning level (i.e., personnel in undermanned ratings have greater promotion opportunity than those in overmanned ratings).

Sea/Shore Rotation for This Rating

  • First Sea Tour: 48 months
  • First Shore Tour: 36 months
  • Second Sea Tour: 36months
  • Second Shore Tour: 36 months
  • Third Sea Tour: 36 months
  • Third Shore Tour: 48 months
  • Fourth Sea Tour: 36 months
  • Forth Shore Tour: 48 months

CTMs are detailed according to billet and relief availability. Most PCS afloat tours are 48 months for those with NECS of 9224, 9225, and 9289.

CTM 9229 requires 60 months of sea duty obligation following initial skills training.

Much of the above information courtesy of the Navy Personnel Command