Marine 0631 Network Administrator vs 0671 Data Systems Administrator
0631 Network Administrator and 0671 Data Systems Administrator both live inside the 06 Communications field, and both pipelines run through MCCES at Twentynine Palms. After a shared Basic Communications Course, the two jobs split into separate specializations.
The network administrator owns the routers, switches, and WAN links that move data between units. The data systems administrator owns the servers, operating systems, and directory services those links carry data to and from.
Quick Comparison
| Decision point | 0631 Network Admin | 0671 Data Systems Admin |
|---|---|---|
| Core role | Installs, operates, and maintains Marine Corps local area networks and wide area networks to support command and control. Duties include routing and switching configuration, cybersecurity procedures, VPN management, traffic monitoring, bandwidth management, premise wiring, and technical-control site operations in garrison and expeditionary environments. | Installs, operates, and maintains the computer and network operating systems that support Marine Corps command and control. Duties span Linux, Microsoft, and Unix environments and include Active Directory administration, DNS, PKI, cybersecurity monitoring, database administration, unified communications, storage systems, virtualization, and client-server configuration in garrison and deployed settings. |
| Test gate | ASVAB (CL 105 or EL 105) | ASVAB (CL 100 or EL 100) |
| Score summary | Requires CL 105 or EL 105 minimum, on top of the AFQT minimum of 31 for high school diploma holders. Secret clearance eligibility required at accession. | Requires CL 100 or EL 100 minimum, on top of the AFQT minimum of 31 for high school diploma holders. Secret clearance eligibility required at accession. |
| Training path | Boot Camp (13 weeks) at MCRD San Diego or Parris Island, Marine Combat Training (29 days) at SOI-West or SOI-East, Basic Communications Course (approx. 6-8 weeks) at MCCES Twentynine Palms, then Network Administrator Course (approx. 13 weeks) at MCCES Twentynine Palms where MOS is awarded. | Boot Camp (13 weeks) at MCRD San Diego or Parris Island, Marine Combat Training (29 days) at SOI-West or SOI-East, Basic Communications Course (approx. 6-8 weeks) at MCCES Twentynine Palms, then Data Systems Administrator Course (approx. 14 weeks) at MCCES Twentynine Palms where MOS is awarded. |
| Work setting | Network operations centers, communications hubs, and technical-control facilities in garrison; tents, vehicles, and temporary structures in the field. Common duty stations include Camp Pendleton, Camp Lejeune, Twentynine Palms, Quantico, Okinawa, and MCB Hawaii. | Server rooms, network operations centers, and communications facilities in garrison; tents, hardened shelters, and vehicle-mounted configurations in the field. Common duty stations include Camp Lejeune, Camp Pendleton, Quantico, Twentynine Palms, Okinawa, and MCB Hawaii. |
| Deployment pattern | Deploys with supported units. MEU rotations typically six to seven months. Pre-deployment workups add three to six months of high operational tempo before the float. | Deploys with command-and-control elements. MEU rotations approximately six to seven months. Individual augmentation billets to joint task forces also possible. |
| Best fit | Best for applicants who score CL 105 or EL 105 or higher, want to configure network infrastructure, and want a civilian career path in network administration or network security. | Best for applicants who score CL 100 or EL 100 or higher, want to work across Windows, Linux, and Unix server environments, and want a civilian career path in systems administration, cloud engineering, or IT security. |
| Less ideal if | Less ideal for applicants who prefer server and OS work over network hardware, whose CL or EL score falls between 100 and 104, or who want a role centered on virtualization and enterprise software. | Less ideal for applicants who prefer network hardware configuration, whose score already clears CL 105 or EL 105 and networking is their genuine interest, or who dislike authentication and directory services work. |
Both MOS codes are a real IT job from day one. Neither is a junior version of the other. They pull from the same OccFld 06 accession pool, train at the same schoolhouse, and carry the same Secret clearance requirement.
The differences that decide the choice sit in three places:
- What you configure: the network infrastructure that connects systems, or the server and data infrastructure those systems run on.
- How the ASVAB scores compare: both require the same composites, but 0631 sets the threshold five points higher on both.
- What the civilian job market pays for: network engineering and systems administration are distinct career paths with overlapping but not identical hiring pools.
Each of those gets its own section below.
The five-point line-score gap is narrower than it looks on paper. An applicant who clears CL 105 or EL 105 for 0631 has already cleared 0671 by definition. If your score lands between 100 and 104, the 0671 contract is the option that stays open while 0631 does not.
That single threshold is worth knowing before you sit down with a recruiter, not after. Seat counts and score requirements shift with each accession cycle. Clearing the higher bar early leaves you room to negotiate a specific MOS code rather than accepting a broader OccFld 06 field guarantee.
The jobs also share the same duty stations. Both are assigned to communication battalions, MEU support elements, and deployable headquarters units at Camp Pendleton, Camp Lejeune, Twentynine Palms, Quantico, Okinawa, and Marine Corps Base Hawaii.
A 0631 or 0671 Marine in a deployable unit will complete at least one MEU rotation on a standard four-year contract. The deployable commitment is the same for both MOS codes.
What separates the day-to-day experience is the layer of the stack each Marine owns. The sections below show where each MOS diverges in practice.
To go deeper on either job, read the 0631 Network Administrator profile or the 0671 Data Systems Administrator profile. Both sit inside the 06 Communications field, alongside the other 06XX roles you can weigh before you sign.
What Each Marine Actually Does
Both jobs share the 06 baseline: garrison technical work, field exercises, and deployments where the same equipment must function in tents and vehicles. What changes is the layer of the IT stack each Marine is responsible for.
The 0631 Network Role
The 0631 Network Administrator installs, operates, and maintains Marine Corps local area networks and wide area networks to support command and control. Duties include routing and switching configuration, VPN management, cybersecurity procedures, traffic monitoring, bandwidth management, premise wiring, and technical-control site operations in garrison and expeditionary environments.
In garrison, a 0631 Marine starts the day with a network health check: verify uptime on critical links, review SNMP alerts, check WAN utilization, and scan access logs for anomalies. When something degrades, you diagnose and fix it before anyone notices. In the field, you are building networks in tents or temporary facilities with whatever power is available, and the command post cannot be declared ready until the network is up.
The 0631 administrator is accountable for:
- Configuring and managing routers, switches, and firewalls using commercial and military platforms
- Monitoring network performance and responding to outages and degradation
- Managing VPN tunnels, IPsec configurations, and secure communications paths
- Setting up and maintaining structured cabling and technical-control-site interconnects
- Conducting subnetting, IP address management, and traffic analysis
- Applying cybersecurity procedures including access control lists, patching, and log review
0631 operators work with Cisco and military-grade routers, managed switches, firewalls, and VPN appliances. The Marine Corps is expanding software-defined networking work, so 0631 administrators are increasingly working on architectures that will replace legacy hardware platforms.
The 0671 Systems Role
The 0671 Data Systems Administrator installs, operates, and maintains the computer and network operating systems that support Marine Corps command and control. Duties span Linux, Microsoft, and Unix environments and include Active Directory administration, DNS, PKI, cybersecurity monitoring, database administration, unified communications, storage systems, virtualization, and client-server configuration in garrison and deployed settings.
In garrison, a 0671 Marine manages the health of the systems that keep the unit’s information infrastructure running: monitoring server uptime, applying security patches on schedule, managing user accounts in Active Directory, reviewing DNS records for errors, and resolving hardware or software problems. In the field, those same systems must come up quickly from portable equipment, stay secure in austere environments, and keep running on generator power.
The 0671 administrator is accountable for:
- Administering Windows Server, Linux, and Unix-based systems
- Managing Active Directory accounts, group policies, and organizational unit structures
- Configuring and maintaining DNS, DHCP, and PKI services
- Applying security patches and monitoring system logs for anomalies and intrusion indicators
- Administering database systems and storage area networks
- Supporting unified communications platforms including VoIP and collaboration tools
- Configuring and managing virtual machine environments and hypervisor infrastructure
The relationship between the two jobs frames the comparison well. The 0631 Marine maintains the roads; the 0671 Marine maintains the buildings those roads connect. Both must be running for command and control to function.
Qualification Gates
This is where the two contracts stop being interchangeable. Both MOS codes use the same ASVAB composites and both require Secret clearance eligibility at accession. The line-score minimums are what separate them.
Both 0631 and 0671 require the standard active-duty AFQT minimum of 31 for high school diploma holders and 50 for GED holders. Both use the CL (Clerical) and EL (Electronics Repair) composites as the relevant screens. You need to meet at least one of the two composites for each MOS.
| Requirement | 0631 Network Admin | 0671 Data Systems Admin |
|---|---|---|
| ASVAB Line Score | CL 105 or EL 105 | CL 100 or EL 100 |
| AFQT Minimum | 31 (diploma); 50 (GED) | 31 (diploma); 50 (GED) |
| Security Clearance | Secret eligibility required | Secret eligibility required |
| Citizenship | U.S. citizen | U.S. citizen |
| Vision | Normal color vision required | Normal color vision required |
The five-point gap means every applicant who qualifies for 0631 already qualifies for 0671. A score between 100 and 104 on CL or EL means 0671 is available while 0631 is not.
CL and EL measure different aptitude profiles. The CL composite is built from Verbal Expression and Mathematics Knowledge. The EL composite is built from General Science, Arithmetic Reasoning, Mathematics Knowledge, and Electronics Information.
| Composite | Name | Components |
|---|---|---|
| CL | Clerical | VE + MK |
| EL | Electronics Repair | GS + AR + MK + EI |
A strong score in math and verbal tends to carry CL. A strong score in science and electronics tends to carry EL. Either one is sufficient to qualify at the respective threshold.
The clearance requirement is shared. A failed background investigation or ineligibility for a Secret clearance at MEPS results in MOS reassignment regardless of which contract you signed. Loss of clearance eligibility after accession can result in reassignment out of OccFld 06 entirely.
If 0631 is the target, your ASVAB score is the gate. Build it with the ASVAB guide before you sit down with a recruiter.
Training Path
Both pipelines start identically and then diverge into MOS-specific courses at the same schoolhouse. Every 06-field Marine moves through Boot Camp, Marine Combat Training, and the Basic Communications Course before specializing.
| Phase | Duration | Location | Who attends |
|---|---|---|---|
| Boot Camp | 13 weeks | MCRD San Diego or Parris Island | Both |
| Marine Combat Training | 29 days | SOI-West (Camp Pendleton) or SOI-East (Camp Lejeune) | Both |
| Basic Communications Course | Approx. 6-8 weeks | MCCES, Twentynine Palms | Both; shared OccFld 06 foundation |
| Network Administrator Course | Approx. 13 weeks | MCCES, Twentynine Palms | 0631 only; MOS awarded here |
| Data Systems Administrator Course | Approx. 14 weeks | MCCES, Twentynine Palms | 0671 only; MOS awarded here |
The Basic Communications Course gives all 06-field Marines a shared technical baseline covering radio theory, COMSEC fundamentals, and field communications. Both 0631 and 0671 Marines complete this course before entering their MOS-specific track.
MOS-Specific Courses at MCCES
The 0631 Network Administrator Course runs approximately 13 weeks and covers routing and switching configuration, VPN management, IPsec, cybersecurity fundamentals, and network management tools used in Marine Corps operational environments.
The 0671 Data Systems Administrator Course runs approximately 14 weeks and covers Windows Server administration, Linux system management, Active Directory, DNS, PKI, cybersecurity monitoring, storage systems, and virtualization.
The one-week difference in MOS course length is minor compared to the total pipeline commitment. Plan for roughly seven to eight months from Boot Camp through MOS school before you report to a unit. Both MOS codes finish at MCCES Twentynine Palms.
The base is geographically isolated and the training pace is demanding. That reality applies to every 06-field Marine regardless of MOS. Understanding it before you enlist sets realistic expectations for your first year.
Advanced Courses and Lateral Mobility
Both fields support advanced training after initial qualification. The 0631 Network Supervisor Course prepares senior operators for the 0639 Network Chief NMOS. The 0671 Data Systems Supervisor Course prepares senior operators for the 0679 Data Systems Chief NMOS.
Both fields also support lateral movement toward OccFld 17 cyber billets. That path requires meeting screening requirements specific to those programs, separate from OccFld 06 entry requirements.
Skills, Certifications, and Civilian Transfer
The civilian career transfer value of both MOS codes is one of the clearest in the enlisted Marine inventory. Both jobs map directly to occupations that civilian employers hire for consistently.
For the 0631 Network Administrator, the civilian path points toward network infrastructure roles. The daily work in routing, switching, VPN management, and network monitoring maps to what network administrators and engineers do in corporate IT, federal agencies, and defense contractors.
Certifications that align closely with 0631 training:
- CompTIA Network+: validates networking fundamentals that align directly with Network Administrator Course content
- CompTIA Security+: required by many DoD contractor roles; aligns with the cybersecurity components of 0631 training
- Cisco CCNA: industry-standard networking certification valued in enterprise IT hiring
For the 0671 Data Systems Administrator, the civilian path points toward server and systems administration roles. Active Directory, virtualization, storage management, and server administration are skills employers recognize across enterprise IT and government settings.
Certifications that align closely with 0671 training:
- CompTIA A+: foundation IT certification valued across the hiring market
- CompTIA Security+: required by many DoD contractor roles; directly supported by 0671 cybersecurity training
- Microsoft Certified Azure Administrator or Windows Server certification: validates the specific platform skills central to this MOS
- VMware VCP: validates virtualization skills relevant to 0671 hypervisor work
Both MOS codes require a Secret clearance to enter the field, and Marines who keep their eligibility typically separate with an active clearance. That clearance is a competitive advantage in defense contracting and government IT hiring because it eliminates a screening step that takes months for candidates starting without one.
| Civilian Role | Median Annual Salary | Mapped from |
|---|---|---|
| Network and Computer Systems Administrator | $95,360 | 0631 |
| Information Security Analyst | $120,360 | Both |
| Network Architect | $129,840 | 0631 |
| Systems Administrator | $95,360 | Both |
| Database Administrator | $112,120 | 0671 |
Data from U.S. Bureau of Labor Statistics, Occupational Outlook Handbook.
Tuition Assistance supports certification study and college coursework while on active duty, up to $4,500 per year. Marines who earn one or two certifications before separation compete at a higher level in civilian hiring than candidates with comparable years of experience but no credentials.
Which One Fits You
Both jobs demand a qualifying ASVAB line score, a clean background for Secret clearance eligibility, and genuine interest in technical IT work. The choice comes down to which layer of the IT stack you want to own and what your ASVAB score permits.
0631 Network Administrator
Choose it if you want to own the network infrastructure layer: routers, switches, firewalls, and the links that connect everything. The civilian path from this MOS points toward network administration, network security, and eventually network architecture.
- Best fit: you want to configure network infrastructure, you score CL 105 or EL 105 or higher, you are comfortable with procedural security requirements and documentation discipline, and you want a civilian career path in networking.
- Poor fit: you prefer working on operating systems and server software over network hardware, your CL or EL score is between 100 and 104, or you want a role closer to virtualization and enterprise software platforms.
0671 Data Systems Administrator
Choose it if you want to own the server and data layer: operating systems, directory services, storage, and the applications that run on top of the network. The civilian path from this MOS points toward systems administration, cloud engineering, and IT security roles.
- Best fit: you want to work across multiple platforms including Windows, Linux, and Unix, you score CL 100 or EL 100 or higher, you are patient with complex multi-system troubleshooting, and you want a civilian career path in systems administration or cloud infrastructure.
- Poor fit: you prefer network hardware configuration to server software work, your score already clears CL 105 or EL 105 and network infrastructure is your genuine interest, or you dislike working with authentication and directory services.
If both still appeal, let your ASVAB line score guide the order. A CL 105 or EL 105 clears both gates and keeps both options open for contract negotiation. A score between 100 and 104 means 0671 is the available path.
Either way, clear the score before you walk into the recruiting station. That is how you control the conversation.
More Information
Before you choose between 0631 and 0671, lock in your ASVAB line score, because that is the first filter a recruiter applies to OccFld 06 contracts. Start with the ASVAB study guide for a prep plan and composite breakdown, then talk with a Marine Corps recruiter about current OccFld 06 contracts, quota availability, and accession timing for each MOS.
Explore more in the 06 Communications field, compare the full 0631 Network Administrator and 0671 Data Systems Administrator profiles, or browse the rest of the Marine Corps guides for more decision-stage comparisons.