AWS announced GovCloud a new AWS region specifically designed for the US gov't users.
AWS GovCloud (US)
AWS GovCloud is an AWS Region designed to allow U.S. government agencies and contractors to move more sensitive workloads into the cloud by addressing their specific regulatory and compliance requirements. Previously, government agencies with data subject to compliance regulations such as the International Traffic in Arms Regulations (ITAR), which governs how organizations manage and store defense-related data, were unable to process and store data in the cloud that the federal government mandated be accessible only by U.S. persons.
Part of what AWS has done is isolate the Region to have only US citizens.
Because AWS GovCloud is physically and logically accessible by U.S. persons only, government agencies can now manage more heavily regulated data in AWS while remaining compliant with strict federal requirements. The new Region offers the same high level of security as other AWS Regions and supports existing AWS security controls and certifications such as FISMA, SAS-70, ISO 27001, FIPS 140-2 compliant end points, and PCI DSS Level 1. AWS also provides an environment that enables agencies to comply with HIPAA regulations.