Marine Corps MOS · Communications
0621 Transmissions System Operator
Overview
A Transmissions System Operator installs, operates, and maintains single and dual channel radios, vehicular and man-pack systems, and multichannel line of sight systems across HF, VHF, UHF, and SHF bands. The operator establishes over-the-air links between distant stations, manages message traffic and information flow, and implements authorized changes to network parameters, encryption protocols, and transmission security.
Minimum clearance: Secret
Core Skills
- RF communications theory
- Single- and multi-channel radio operations
- Line-of-sight (LOS) and beyond-line-of-sight (BLOS) communications
- Tactical network configuration
- Installation and alignment of antennas and RF systems
- Preventive and corrective maintenance of comms equipment
- Troubleshooting using technical manuals and test equipment
- COMSEC handling and key management procedures
- Spectrum management awareness and deconfliction
- Technical documentation and log-keeping
Civilian Software & Tools
- Linux
- Microsoft Windows
- Bash
- Microsoft Active Directory
- Microsoft Office software
- Microsoft Excel
- Autodesk AutoCAD
- Microsoft Outlook
Civilian Career Paths
- Telecommunications
- Network Operations
- Radio Frequency Engineering
- Help Desk Support
Training & Development
Getting Started
- Amateur Radio Service Operator License: Technician Class · Funded
- Associate Certified Electronics Technician (CETa) · Funded
- Basic Electricity and Electronics: Direct Current (BEE-DC)
Career Growth
- Amateur Radio Service Operator License: General Class · Funded
- General Communications Technician: Level 1 (GCT1) · Funded
- FCC General Radiotelephone Operator License (GROL) · Funded
What the 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.
- Monitor strength, clarity, and reliability of incoming and outgoing signals, and adjust equipment as necessary to maintain quality broadcasts.
- Relay work orders, messages, or information to or from work crews, supervisors, or field inspectors, using telephones or two-way radios.
- Install all necessary transmission equipment components, including antennas or antenna mounts, surge arrestors, transmission lines, connectors, or tower-mounted amplifiers (TMAs).
Related Occupations
- Electrical and Electronics Repairers, Commercial and Industrial Equipment
- First-Line Supervisors of Passenger Attendants
- Computer Network Support Specialists
- Database Administrators
Typical preparation for these civilian roles: vocational training or an associate degree.
Formerly Known As (Legacy)
Retired codes that converted into 0621. Each legacy page documents the cited history.
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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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