mos.directory

Marine Corps MOS · IT & Cyber

0639 Network Chief

Current service use not established

This code is listed in the directory. Inclusion alone does not confirm current service use.

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Overview

Network Chiefs install, operate, maintain, and supervise local and wide area networks that enable command and control. They oversee advanced routing and switching, cybersecurity, cable plans, internet protocol management, encryption management, and network monitoring, and they supervise the establishment of technical control sites.

Minimum clearance: Secret

Minimum ASVAB: EL 105

ASVAB policy: Not policy-reviewed · coverage unknown · as of 2026-10-19

Program scope has not been reviewed.

Policy applicability and coverage of the program's score routes have not been reviewed. Shown-route arithmetic is not an eligibility decision.

Source: navmc-1200-1l-fy26 (source date 2025-03). Policy applicability has not been established.

See if you would hit this score: free ASVAB practice test

Core Skills

  • Advanced routing and quality of service
  • Cable plan and long-haul transport management
  • Network cybersecurity and encryption management
  • End-to-end systems integration and fault isolation

Civilian Career Paths

Career associations are editorial assessments of the cited evidence, not an official crosswalk unless the evidence explicitly says so. O*NET supplies civilian occupation information, not proof of a military match. Related experience does not confer civilian qualifications. Tasks and tools below describe civilian work, not military training.

Network and Computer Systems Administrators

Installing and maintaining LANs and WANs, monitoring network performance, and correcting faults transfer directly to civilian network administration.

How to prepare: Build a Linux network administration lab and document a fault diagnosis, configuration correction, and post-repair performance check.

What the civilian work involves
  • Maintain and administer computer networks and related computing environments, including computer hardware, systems software, applications software, and all configurations.
  • Diagnose, troubleshoot, and resolve hardware, software, or other network and system problems, and replace defective components when necessary.
  • Operate master consoles to monitor the performance of computer systems and networks and to coordinate computer network access and use.
Civilian tools and software (examples)
  • Linux
  • Ansible software
  • Microsoft Active Directory

Computer Network Architects

Advanced routing and switching, quality of service, long-haul transport, and end-to-end systems integration provide a foundation for developing network solutions and coordinating upgrades.

How to prepare: Create a sample enterprise network upgrade design showing routing choices, quality-of-service priorities, security measures, and a test plan.

What the civilian work involves
  • Develop or recommend network security measures, such as firewalls, network security audits, or automated security probes.
  • Develop and implement solutions for network problems.
  • Coordinate network operations, maintenance, repairs, or upgrades.
Civilian tools and software (examples)
  • Border Gateway Protocol BGP
  • Ansible software
  • IBM Terraform

Training & Development

Choose credentials for your target role. COOL funding markers describe program listings, not a guarantee of eligibility or funding.

Getting Started

  • Cisco Certified Network Associate (CCNA) · Funded

    Validate network access, IP connectivity, IP services, security fundamentals, and automation knowledge for civilian networking work.

    Eligibility and preparation: No prerequisites; earning the certification requires passing exam 200-301 CCNA.

    For: Network and Computer Systems Administrators, Computer Network Architects

  • CompTIA Security+ · Funded

    Strengthen the security foundation used to secure administered networks and evaluate network security measures.

    For: Network and Computer Systems Administrators, Computer Network Architects

Notes & Sources

Evidence for this guidance (6 documents)
  1. NAVMC 1200.1L (FY26, in force): MOS 0639

    [1] MOS 0639 section "a. Summary"; cached text line 30390; NAVMC 1200.1L signed 2025-03-07, in force until 2026-10-01

    Supports: Advanced routing and quality of service, Cable plan and long-haul transport management, Network cybersecurity and encryption management, End-to-end systems integration and fault isolation, Network and Computer Systems Administrators (O*NET 15-1244.00), Computer Network Architects (O*NET 15-1241.00)

  2. O*NET: Network and Computer Systems Administrators

    [2] O*NET 30.3 occupational data

    Supports: Network and Computer Systems Administrators (O*NET 15-1244.00)

  3. O*NET: Computer Network Architects

    [3] O*NET 30.3 occupational data

    Supports: Computer Network Architects (O*NET 15-1241.00)

  4. COOL credential mapping: Cisco Certified Network Associate (CCNA)

    [4] 0639 cached COOL credential feed

    Supports: Cisco Certified Network Associate (CCNA)

    [5]Cisco: CCNA certification · How to earn your CCNA, Core exam 200-301 CCNA; updated 31 August 2026, retrieved 23 September 2026

    Supports: Cisco Certified Network Associate (CCNA)

  5. COOL credential mapping: CompTIA Security+

    [6] 0639 cached COOL credential feed

    Supports: CompTIA Security+

  6. CompTIA Security+ exam details

    [7] Exam details, recommended experience

    Supports: CompTIA Security+

Defense contractor jobs for 0639

Predecessor codes

Historical codes with documented links to 0639. Each history page explains the change.

0612Tactical Switching Operator (PMOS)0619Telecommunications Systems Chief (PMOS)0651Cyber Network Operator (PMOS)0659Cyber Network Systems Chief (PMOS)2823Technical Control Chief (PMOS)

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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