Microsoft announces the launch of a new offering for its mission-critical Azure Government cloud targeted at government customers and partners that regularly work with top-secret classified data. Microsoft provides access to Azure Government offerings only to US federal, state, local, tribal governments, and their partners, with operations in these cloud regions available only to screened US citizens. Microsoft also launched new features for the US Department of Defense, law enforcement, and other agencies in the Azure Government Secret cloud, authorized by DoD Impact Level 6 and Intelligence Community Directive (ICD) 503.
Source: https://www.bleepingcomputer.com/news/security/microsoft-announces-azure-cloud-for-top-secret-government-data/