Marine Corps
COMMUNICATIONS

MOS

0621

Transmissions System Operator

Description

Transmissions System Operators employ transmissions systems to enable essential warfighting functions including Intelligence, Fires, Logistics, Information, Command and Control (C2), Force Protection, and Maneuver capabilities to support activities across Department of Defense (DoD) operational domains. Their responsibilities encompass installation, operation, and maintenance of single and dual channel radio including vehicular and man-pack systems, and Multi-Channel Line of Sight (LOS) systems operating in HF, VHF, UHF, and SHF bands, establishing over-the-air (OTA) transmission links between a multitude of distant stations, message traffic management, information flow, and dissemination and implementation of authorized changes to network parameters, encryption protocols, and transmissions security; planning, coordinating, and executing operations using program of record and commercial-of-the-shelf (COTS) equipment and field-expedient antennas for network integration, proficiency with specialized computer hardware/software planning tools, Transmission Security (TRANSEC), and Communications Security (COMSEC), and are familiar with spectrum analyzing tools and DoD approved Position Navigation and Timing (PNT) devices. Operators may be assigned to Billet Identification Codes (BIC) within their field, associated with DoD Cyber Workforce Framework (DCWF) work role codes. Additional training and certification requirements related to these codes are outlined in DoDI 8140.10, DoDM 8140.10, and the MOS roadmap.

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
  • IP networking fundamentals
  • Satellite and troposcatter communications basics
  • 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
  • Field wiring and cable management
  • Spectrum management awareness and deconfliction
  • Operating in austere and deployed environments
  • Technical documentation and log-keeping
  • Team coordination and small-unit leadership
  • Operational risk management and safety procedures
  • Customer support and user training on communications equipment

Common Certifications

  • CompTIA Security+
  • CompTIA Network+
  • Cisco CCNA
  • CompTIA CySA+
  • Cisco ENARSI (Implementing Cisco Enterprise Advanced Routing and Services)
  • GIAC Certified Incident Handler (GCIH)
  • ITIL 4 Foundation

Civilian Career Paths

  • TELECOMMUNICATIONS
  • NETWORK OPERATIONS
  • RADIO FREQUENCY ENGINEERING
  • HELP DESK SUPPORT

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Data sourced from official Marine Corps publications and public military occupational references. Descriptions may be summarized for clarity. Verify all information with your branch career counselor or official military documentation before making career decisions.