26 Signals Intelligence, Electronic Warfare, and Cyberspace Operations
Marine Corps OccFld 26 is the field for Marines who collect, analyze, and manage signals intelligence, electronic warfare, and related technical mission systems. It is one of the strongest technical and clearance-heavy fields in the Corps.
This hub follows the current FY2026 field structure. That matters because older public Marine pages still use shorter labels like ground electronic warfare while the live MOS manual now shows a wider SIGINT, EW, and cyberspace operations frame.
The official 26 field page says the field focuses on strategic and tactical intelligence tied to radio and other broadcasts and includes signals intelligence analysts, cryptologic work, and ISR systems engineering. The current NAVMC 1200.1L MOS Manual uses the broader field title Signals Intelligence, Electronic Warfare, and Cyberspace Operations.
That combination is the best way to read the field. Some jobs lean harder into collection. Others are analyst-heavy. Others keep the ISR and mission systems side functioning so the whole capability actually works in the operating force.
At a Glance
| Area | What to know |
|---|---|
| Field purpose | Support commanders with collection, analysis, mission systems, and technical exploitation tied to signals and the electromagnetic environment |
| Representative enlisted roles | 2621 Communications Intelligence/Electronic Warfare Operator, 2631 Electronic Intelligence/Electronic Warfare Analyst, 2651 ISR Systems Engineer |
| Screening themes | Security eligibility, technical aptitude, and comfort with classified systems and analytic work |
| Training anchor | Formal SIGINT/EW follow-on schooling after initial Marine training and classification |
| Reserve note | Reserve opportunities exist, but billet access and school timing matter more here than in many broad-access fields |
Which Role Fits You?
Choose 2621 Communications Intelligence/Electronic Warfare Operator if you sit at a collection station, tune to the target frequency, and listen.
Choose 2631 Electronic Intelligence/Electronic Warfare Analyst if a radar emits a pulse.
Choose 2651 ISR Systems Engineer if the 2621 operator is on the collection system.
Common Entry Requirements
All enlisted Marines in this occupational field enlist with a minimum AFQT of 31, a high school diploma, U.S. citizenship, and MEPS medical clearance. Boot Camp is the first training gate: 13 weeks at MCRD San Diego or Parris Island. After graduation, Marines complete Marine Combat Training or the Infantry Training Battalion before attending their MOS-specific school. See each role’s profile below for specific ASVAB line scores, training details, and additional requirements.
Career Field Directory
- 2621 Communications Intelligence/Electronic Warfare Operator : You sit at a collection station, tune to the target frequency, and listen
- 2631 Electronic Intelligence/Electronic Warfare Analyst : A radar emits a pulse
- 2651 ISR Systems Engineer : The 2621 operator is on the collection system
Related Resources
If you are aiming for 26XX work, start with the ASVAB guide and PiCAT guide so your score planning is solid before you talk to a recruiter. Then compare the field with 02 Intelligence and 17 Information Maneuver to see where the mission fit is strongest.