AWS is pleased to announce the immediate availability of a new automated sign-up capability for AWS GovCloud (US). The new self-service capability greatly reduces the time it takes for qualified customers to gain access to AWS GovCloud (US). To gather started,log in with root credentials for your standard AWS account to enable consume of AWS GovCloud (US), navigate to the My Account page from the AWS Management Console, or select the “Sign Up for AWS GovCloud (US)” button. Note that automated sign-up is only available to direct AWS customers in the United States.
Source: amazon.com