AWS GovCloud Explained for Defense Contractors
Last updated: October 2026
AWS GovCloud (US) is a set of isolated AWS regions built for U.S. government workloads, with FedRAMP High authorization and access limited to screened U.S. persons. Defense contractors need it, or an equivalent like Azure Government, when they store or process CUI or export-controlled data in AWS. GovCloud gives you a compliant platform, but it does not make you CMMC compliant on its own.
Where you host CUI is a compliance decision, not just an IT one. This guide explains what GovCloud is, how it supports CMMC, how it compares to Microsoft’s government clouds, and what you still own once you move in.
What is AWS GovCloud?
AWS GovCloud (US) is physically and logically separated from commercial AWS. Accounts are vetted, and the regions are operated by screened U.S. persons.
It is designed for workloads that fall under U.S. government rules, including:
- ITAR and EAR export-controlled data
- FedRAMP High authorization
- DoD Cloud Computing Security Requirements Guide impact levels IL2, IL4, and IL5 for supported services
Why commercial AWS is not enough for CUI
Under DFARS 252.204-7012, any cloud provider that stores or processes CUI for a DoD contract must meet the FedRAMP Moderate baseline or its equivalent. GovCloud’s FedRAMP High authorization clears that bar.
Commercial AWS regions are not the right home for CUI or ITAR data. Putting it there, even by accident, creates a gap that can surface during an assessment or a prime’s review.
GovCloud as the home for a CUI enclave
Many contractors use GovCloud to host a government cloud enclave: a defined boundary where CUI is processed, stored, and sent under strict controls. A well-built enclave keeps the rest of your business out of scope. Our guide to CMMC scoping explains what counts as in scope.
Deciding when to move? See AWS GovCloud vs commercial AWS: when to switch.
How AWS GovCloud supports CMMC compliance
CMMC is the Department of War’s program for verifying that contractors protect FCI and CUI. CMMC Level 2 covers the 110 security requirements in NIST SP 800-171 Rev. 2.
Where CMMC stands in 2026
On July 13, 2026, the Department of War suspended CMMC Phase 2, which would have required third-party (C3PAO) assessments in new contracts starting November 10, 2026. A reform task force is reviewing the program.
Your obligations did not go away. DFARS 252.204-7012, NIST SP 800-171, Level 1 and Level 2 self-assessments, SPRS scores, and annual affirmations all remain in force, and primes can still require certification before they share CUI.
GovCloud tools that map to CMMC requirements
GovCloud gives you native tools for several CMMC domains:
- Access control and identity. IAM policies, multifactor authentication, and role-based access.
- Audit and accountability. CloudTrail, AWS Config, and Security Hub for logging, monitoring, and audit evidence.
- Configuration management. Automated baselines that keep systems in a known, secure state.
- Incident response. Integration with detection and response tooling, plus the records you need for DFARS 72-hour reporting.
GovCloud alone does not equal CMMC compliance
GovCloud is a compliant platform, not a compliance program. Under the AWS shared responsibility model, AWS secures the cloud itself. You are responsible for everything you build and run in it.
| Area | AWS is responsible for | You (and your partner) are responsible for |
|---|---|---|
| Facilities and hardware | Data centers, physical security, servers, storage, and network hardware | Nothing here; this is inherited from AWS |
| Platform | Hypervisor, region isolation, and the FedRAMP High authorization of GovCloud services | Choosing only services authorized for your impact level |
| Identity and access | The IAM service itself | Users, roles, MFA, least privilege, and access reviews |
| Configuration | Secure defaults on the service side | Network segmentation, encryption settings, baselines, and patching of your systems |
| Logging and monitoring | Making CloudTrail, Config, and Security Hub available | Turning them on, reviewing alerts, and keeping the records |
| Documentation | AWS compliance reports you can reference | Your System Security Plan, POA&M, SPRS score, and assessment evidence |
That is why most contractors pair GovCloud with a partner who configures it correctly, runs it day to day, and keeps the evidence current. Our CMMC services cover the controls and documentation side.
AWS GovCloud vs Azure Government and GCC High
This question comes up constantly in the Defense Industrial Base. The honest answer is that it depends on the workload, and many contractors use more than one.
It helps to separate two things. Azure Government is Microsoft’s infrastructure cloud and the closest match to AWS GovCloud. Microsoft 365 GCC High is Microsoft’s productivity suite for CUI, and it runs in Microsoft’s government cloud.
| AWS GovCloud (US) | Azure Government | Microsoft 365 GCC High | |
|---|---|---|---|
| What it is | Isolated AWS regions for infrastructure and apps | Isolated Azure regions for infrastructure and apps | Microsoft 365 productivity suite in Microsoft’s U.S. government cloud |
| Best for | Custom apps, DevSecOps, containers, data and analytics | Microsoft-centric infrastructure, Windows and .NET workloads | Email, Teams, SharePoint, and OneDrive with CUI |
| FedRAMP | High | High | High |
| ITAR and export-controlled data | Supported | Supported | Supported |
| Access restricted to U.S. persons | Yes | Yes | Yes |
| Typical DIB pattern | Application and data enclave | Infrastructure enclave for Microsoft shops | Collaboration enclave |
When AWS GovCloud fits best
GovCloud is a strong choice for custom applications, containers, DevSecOps pipelines, and data and analytics workloads. Its broad service catalog makes it a natural home for cloud-native enclaves. VSO supports DoD clients in AWS GovCloud at IL4 and IL5.
When Microsoft’s government clouds fit best
If your people live in Outlook, Teams, and SharePoint and handle CUI, Microsoft 365 GCC High is usually the right home for that work. Azure Government suits organizations that want their infrastructure in the same Microsoft ecosystem as Entra ID, Intune, and Defender.
Running both
A common pattern is GCC High for collaboration and AWS GovCloud for applications and data. That works well, but it means coordinating identity, access, and compliance documentation across two platforms.
For the Microsoft side, see our GCC High vs GCC vs Commercial comparison. For costs, see Azure Government vs AWS GovCloud: a 2026 cost and capability comparison.
Why defense contractors use a managed services partner for GovCloud
Standing up GovCloud is a project. Keeping it compliant is an ongoing job.
Operations never stop
Patching, credential rotation, log reviews, configuration checks, and evidence collection are continuous. Most DIB IT teams do not have the hours or the specialized tools to do all of it well.
Assessments run on evidence
CMMC assessments and prime reviews look for proof, not intent. A partner with CMMC experience keeps documentation current, so you are not scrambling before an assessment or a prime’s request.
Who has access matters
With CUI in play, you need to know exactly who can reach your environment. VSO’s technical staff are U.S.-based, with cleared personnel available when your contracts require them, and many are veterans who bring mission accountability to the work.
Mistakes are expensive
A gap found during an assessment can cost contract eligibility. A misconfigured GovCloud environment can lead to a reportable incident. Proactive management lowers both risks.
Build it, run it, or both: your choice
Not every contractor wants to outsource ongoing IT, and you should not have to. VSO has built many GovCloud environments and then handed the keys back to the customer’s own team, with the documentation and knowledge transfer to run it with confidence.
We scope the work around what you ask for and do exactly that. If you want us to manage the environment long term, we work as an extension of your team. If you only need the build, we build it right and step back. We will not push you into services you do not need.
The bottom line
AWS GovCloud is a strong, compliant foundation for defense contractors handling CUI. Getting value from it takes correct configuration, continuous operations, and evidence that holds up to review.
Ready to secure your cloud environment?
If you are evaluating AWS GovCloud, preparing for CMMC, or looking for a partner that knows the Defense Industrial Base, let’s talk. VSO builds and manages AWS GovCloud and Azure Government environments, delivered by U.S.-based staff, with cleared personnel available when your contracts require them. Tell us what you need, and we will scope exactly that.
Call (888) 805-0510, email sales@vso-inc.com, or contact us to request a quote.
Frequently asked questions
About the author
Ethan Watts is the VP of Commercial and Channel Business at VSO, where he leads sales and delivery across dozens of contracts and engagements. He works closely with clients and partners to plan and reach their IT goals.
