U.S. Marines · Communications
Marine Corps MOS 0621 is the Field Radio Operator (also titled Transmission System Operator) — the Marine who installs, operates, and maintains single-channel and multi-channel field radios to pass voice and data traffic for tactical units. Duties include setting up antennas and power sources, establishing and maintaining radio nets, processing and logging messages, and loading frequencies and cryptographic fills. This is the radio MOS; the wire/cable specialty is the separate MOS 0612 (Tactical Switching Operator / Field Wireman).
0621 (Field Radio Operator) is in the Marines and requires a minimum AFQT of 32 and EL of at least 90. Last verified 2026-06-24 against Military Yearbook Project — USMC MOS 0621 (per MCO 1200.18).
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Plain requirement
Source: Military Yearbook Project — USMC MOS 0621 (per MCO 1200.18) · last verified 2026-06-24.
Role brief
Marine Corps MOS 0621 is the Field Radio Operator (also titled Transmission System Operator) — the Marine who installs, operates, and maintains single-channel and multi-channel field radios to pass voice and data traffic for tactical units. Duties include setting up antennas and power sources, establishing and maintaining radio nets, processing and logging messages, and loading frequencies and cryptographic fills. This is the radio MOS; the wire/cable specialty is the separate MOS 0612 (Tactical Switching Operator / Field Wireman).
Starting pay · 2026
Base pay is set by pay grade, not by job — every Marines enlistee at the same grade earns the same monthly base pay. These are the 2026 active-duty rates (3.8% raise, effective 2026-01-01).
| Grade | Rank | Monthly base pay | Service |
|---|---|---|---|
| E-1 | Private (Pvt) | $2,407 | after 4 months of service |
| E-2 | Private First Class (PFC) | $2,698 | under 2 years |
| E-3 | Lance Corporal (LCpl) | $2,837 | under 2 years |
| E-4 | Corporal (Cpl) | $3,142 | under 2 years |
Source: DFAS 2026 active-duty basic pay tables (3.8% raise, effective Jan 1 2026) · last verified 2026-05-23 · date retrieved 2026-05-23.
Eligibility notes
MOS 0621 is the Field Radio Operator — the Marine who runs tactical radios and radio nets. MOS 0612 is the Tactical Switching Operator / Field Wireman, a wire-and-cable specialty that lays field wire and operates telephone switchboards. Both are in the 06XX Communications field and both carry an EL line-score requirement, but they are separate jobs with separate schools at MCCES.
A 0621 sets up and operates single-channel and multi-channel field radios, erects antennas, establishes and maintains radio nets, sends and logs messages, and loads frequencies and cryptographic keys for tactical units. Per the Military Yearbook Project (MCO 1200.18), the entry standard is an EL (Electronics) line score of at least 90.
0621 Marines attend the Field Radio Operator Course at the Marine Corps Communication-Electronics School (MCCES), Marine Corps Air Ground Combat Center Twentynine Palms, California, after recruit training and Marine Combat Training. Source: Military Yearbook Project — USMC MOS 0621, last verified 2026-06-24.
The Marines Field Radio Operator MOS (0621) requires a minimum AFQT of 32 and EL of at least 90, with initial training of about 8 weeks. Those are the ASVAB-based entry requirements; a recruiter confirms the full enlistment picture (medical, background, and current openings). Source: Military Yearbook Project — USMC MOS 0621 (per MCO 1200.18), last verified 2026-06-24.
0621 initial training runs about 8 weeks. Source: Military Yearbook Project — USMC MOS 0621 (per MCO 1200.18), last verified 2026-06-24.
Source: Military Yearbook Project — USMC MOS 0621 (per MCO 1200.18) · last verified 2026-06-24 · date retrieved 2026-06-24.
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