That seems like an intended feature. I think that AWS GovCloud isn't designed for classified information, or for Government use only.
From the advertising page:
> The region is operated by employees who are U.S. citizens on U.S. soil. The region is only accessible to vetted U.S. entities and root account holders, who must confirm they are U.S. Persons to gain access to this region.
As long as you've proved you're a US Entity, it seems like you should be able to use GovCloud.
GovCloud seems like it's just some box-checking activity to ensure that there aren't any foreigners interacting with the system. Other than that, it's not any different from normal AWS regions.
From the advertising page:
> The region is operated by employees who are U.S. citizens on U.S. soil. The region is only accessible to vetted U.S. entities and root account holders, who must confirm they are U.S. Persons to gain access to this region.
As long as you've proved you're a US Entity, it seems like you should be able to use GovCloud.
GovCloud seems like it's just some box-checking activity to ensure that there aren't any foreigners interacting with the system. Other than that, it's not any different from normal AWS regions.