Acquia is FedRAMP accredited as well. Acquia is optimized for Drupal. Drupal now powers 40% of .gov sites in the US (and growing). It's a fully managed and supported platform, which offers not only the CLI integrations that developers appreciate but accessible, responsive GUI DevOps tools and 24/7/365 application support.
http://www.fedramp.gov/marketplace/compliant-systems/blackme...
http://www.fedramp.gov/marketplace/compliant-systems/autonom...
Both built on Red Hat OpenShift