0631 vs 0671
Network Administrator (USMC) vs Data Systems Administrator (USMC)
Two Marine MOS codes that went through the same boot camp and have agreed on absolutely nothing since graduation day.
If 0631 had a dating profile, it would mention: in the field, you're building tactical networks from scratch — setting up a COC's entire data backbone with military networking gear that is not Cisco no matter how much the recruiter implied it was. If 0671 had one: the training pipeline at MCCESS is decent but moves fast — if you don't have some IT aptitude going in, you'll be drinking from a firehose. One military. Two MOS codes that swiped right on completely different career experiences. Two MOS codes that recruiting sees as "whatever gets the quota." Service members see it differently.
Recruiter vs. Reality
The pitch versus what people who actually did the job report back.
“You'll build and maintain the network backbone that connects every Marine in the fight. Routers, switches, firewalls, tactical data links — you own the infrastructure that makes command and control possible. CCNA-level networking skills are in massive civilian demand, and the cleared network engineers the Marine Corps produces are exactly what defense contractors and enterprise IT shops are hiring. This used to be lumped together with systems administration under 0651 — now you get to specialize in what matters: the network itself.”
You are the plumber of Marine Corps IT — you own the pipes. Switches, routers, firewalls, cable runs, IP schemes, VLANs, and whatever tactical network gear the Corps is fielding this year. When the 0651 split happened, 31s got the network infrastructure and 71s got the servers and systems. In practice, especially in smaller units, you still end up doing some of both because there aren't enough bodies. In garrison, your life is managing network closets, running cable, configuring switches, and troubleshooting why building 4200 can't reach the print server. In the field, you're building tactical networks from scratch — setting up a COC's entire data backbone with military networking gear that is not Cisco no matter how much the recruiter implied it was. Training at MCCESS covers the fundamentals but you'll learn the real stuff on the job. Get your CCNA on your own time — the military courses don't go deep enough for the civilian market. The good news: networking is one of the most transferable military IT skills. Companies need people who can troubleshoot at the packet level under pressure, and that's exactly what deployed Marine network admins do every day.
“You'll be the systems backbone of the Marine Corps — managing servers, Active Directory, virtualization, and enterprise services that the entire MAGTF depends on. The certs you'll earn (Security+, Server+, eventually MCSA or cloud certs) are the same ones Fortune 500 companies require. Cleared sysadmins with hands-on operational experience start at $80-100K+ on the civilian side, and the demand has not slowed down. This used to be part of 0651 — the split means you specialize deeper in systems instead of trying to be a network admin and a sysadmin at the same time.”
The 0651 split into 0631 and 0671 was overdue — the old MOS was trying to make one Marine a network engineer AND a systems administrator AND a help desk tech. Now 31s own the network infrastructure (switches, routers, tactical data links) and you own everything else: servers, workstations, Active Directory, Exchange, imaging, patching, backups, virtualization, and whatever enterprise service the Corps decides to bolt on this fiscal year. Your daily life is sysadmin work — building out server racks in a server room on garrison, or running a COC's entire IT infrastructure out of a tent in the field with generators and tactical satellite. You will learn more from breaking things and fixing them under pressure than from any course. The training pipeline at MCCESS is decent but moves fast — if you don't have some IT aptitude going in, you'll be drinking from a firehose. Security+ is mandatory for your job (DoD 8570 baseline cert), and your command will usually send you. The civilian translation is strong — every company needs sysadmins, and cleared ones with Secret or TS/SCI are in constant demand. The frustrating part: you're responsible for everything working, but you rarely get credit when it does. When the Colonel's email is down, you are the most important person in the building. When it's working, you're invisible. Welcome to IT.
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