Starting today, Amazon EC2 M5 instances are available in the AWS GovCloud (US) Region. M5 instances, the next generation of the Amazon EC2 General Purpose compute instances, were introduced in November 2017 to offer a balance of compute, memory, storage and networking resources for a broad range of customers’ workloads.

Source: Amazon Web Services News Amazon EC2 M5 Instances Are Now Available in the AWS GovCloud (US) Region