Implementing GCC High for Government Contractors

At RSM US LLP, we guide government contractors through the complexities of regulatory environments with a focus on secure cloud solutions like Microsoft Government Community Cloud High (GCC High). As contractors increasingly handle controlled unclassified information (CUI), including International Traffic in Arms Regulations (ITAR) and Export Administration Regulations (EAR) controlled data, the demand for compliant, scalable, and secure infrastructure has never been higher.

One of our most impactful projects involved a high-growth government contractor transitioning to GCC High—the most complex and secure cloud migration path available. Our approach ensured that all business units operated within the same compliant environment, reducing risks associated with split systems. RSM helped the client establish a secure infrastructure capable of supporting sensitive data, positioning them to pursue high-value federal contracts.

Our Approach to GCC High Implementation

A successful GCC High implementation begins with the right guardrails. RSM follows a well-defined process that prioritizes compliance and data security, beginning with an assessment to determine whether a company handles ITAR, EAR, or Controlled Unclassified Information (CUI) data. Based on this assessment, we put the appropriate measures in place to ensure the environment meets all regulatory requirements. We exclusively deploy U.S. citizens, physically based within the United States, who are rigorously trained to handle sensitive information and operate within RSM’s CMMC Level 2–certified environment. This dedicated staffing approach ensures uncompromising compliance and security across all GCC High engagements—covering both project delivery and ongoing managed services. Our strict adherence to Microsoft’s personnel requirements empowers our clients to confidently navigate and thrive within the most highly regulated environments.

The Right Resources and Training

RSM invests heavily in continuous industry and compliance training, ensuring our team identifies when GCC High, DoD, or CUI compliance is needed early in an engagement. This proactive approach enables us to tailor solutions specifically for government contractors. Unlike commercial-only companies, government contractors face stricter regulations, which require solutions designed to prioritize compliance and data protection. We ensure that our approach aligns with federal contracting requirements and the unique needs of our clients.

Secure Enclave Infrastructure

To securely handle sensitive data, we’ve built a secure enclave compliant with Cybersecurity Maturity Model Certification 2.0 (CMMC 2.0) Level 2 standards. This environment allows flexible and secure access to client networks via secure laptops, client-issued devices, or VDI jump boxes, maintaining the highest levels of data protection while offering multiple engagement options.

For ERP implementations within the secure enclave, one of the primary concerns is ensuring compliance and proper data transmission. As a certified CMMC Third Party Assessment Organization (C3PAO), we conduct thorough reviews to ensure all necessary documentation is in place. This not only supports certification efforts but also streamlines the implementation process, guiding clients smoothly toward full compliance within a secure and scalable infrastructure.

Maximizing Value in GCC High Environments

Shifting from a commercial environment to GCC High presents unique challenges, particularly around feature parity. New features often launch first in the commercial cloud, with GCC High features following later. However, GCC High’s seamless integration across Microsoft applications allows for effective use of the full suite.

If needed, we support clients through this transition by assessing their current environment, identifying gaps, and implementing a tailored migration plan. For those who are already in GCC High, we focus on optimizing the environment—ensuring they’re fully leveraging available capabilities and aligning their tools and processes with evolving compliance and operational needs. We also engage directly with Microsoft to influence the product roadmap, bringing forward features as necessary.

Key Considerations for GCC High Tools and Data Transmission

A critical aspect of GCC High implementation is ensuring proper data transmission between applications. We work closely with our cybersecurity team to evaluate and design integrations that do not unnecessarily expand the boundaries of the secure enclave. This helps maintain compliance with sensitive data handling requirements while controlling scope and risk. We also partner with clients to ensure that all tools and applications within the GCC High environment remain fully compliant and aligned with their operational needs.

Why Choose RSM for Your GovCon Solutions?

RSM US LLP is a trusted partner for government contractors, offering specialized expertise in GCC High environments. Here’s why you should choose us for your GovCon solutions:

Knowledge and Experience: We understand the unique challenges of government contractors and have successfully led numerous clients through complex GCC High implementations.

Comprehensive Solutions: From assessment to ongoing support, we provide end-to-end services to ensure your GCC High implementation is seamless and secure.

Customized Approach: We tailor our solutions to meet your specific needs, ensuring alignment with both your business objectives and regulatory requirements.

Proven Track Record: Our track record of successful migrations and compliance achievements positions clients for long-term success in the federal contracting space.

Commitment to Excellence: We are dedicated to delivering exceptional service and going above and beyond to ensure your success.

Certification: RSM is the largest CMMC Certified Third Party Assessor Organization (C3PAO) in the ecosystem and was reauthorized by the CyberAB and the Department of Defense (DoD) in January 2025. In addition, on July 22, 2025, RSM US LLP successfully achieved a CMMC Level 2 certification as an External Service Provider (ESP), authorizing us to deliver compliant Managed Services (MSP) and Managed Security Services (MSSP) to organizations handling sensitive government data. These certifications reinforce our dedication to safeguarding sensitive information and supporting our clients in meeting the Department of Defense’s rigorous cybersecurity requirements

Recognition:

- Microsoft U.S. Defense and Intelligence 2023 Partner of Year Award Winner

- Azure Expert MSP

- Microsoft intelligent Security Association (MISA) Member

Implementing GCC High for government contractors is complex, but with the right expertise, it leads to long-term success. At RSM US LLP, we have the experience and knowledge to help navigate these challenges. If you have questions or need assistance, don’t hesitate to reach out. We’re here to help you achieve a seamless and compliant transition to GCC High.

For information on D365 Business Applications – Jonathan.Reynolds@rsmus.com