Amazon EBS Fast Snapshot Restore (FSR) is now available in AWS GovCloud (US) Regions

You can now enable Fast Snapshot Restore (FSR) on Amazon Elastic Block Store (EBS) snapshots, ensuring that EBS volumes restored from FSR-enabled snapshots instantly receive full provisioned performance. You can enable FSR for an additional hourly charge to your regular snapshot cost for each Availability Zone (AZ) in which FSR is enabled. This new capability enables you to restore multiple volumes from a snapshot without the need to initialize volumes yourself. Improved and predictable performance helps with use cases such as virtual desktop infrastructure (VDI), backup & restore, test/dev volume copies, and booting from custom AMIs. 

Source:: Amazon AWS