Samsung Devices are able to be used, as a commercial off the shelf device, up to Top Secret.
What DoD and DISA were trying to do was folded into the NSA program Fishbowl, which later became the Winterking Architecture for secure communications. This architecture exists today, and Samsung has been working with Federal Civilian and DoD Agencies to deploy this for about 2 years. Others are now on board with this, MobileIron, Apple, LG, and BlackBerry are all either in progress or just received validation. Version 2 of the NSA architecture is currently under development, but is still generally still a COTS focused solution (there are some GOTS products).
If you want to look at the Commecial Solutions for Classified list, it is posted here:
https://www.nsa.gov/resources/everyone/csfc/
Validated Products:
https://www.nsa.gov/resources/everyo...mponents-list/
Also something interesting to read would be the NIAP Common Criteria program, and look at the products, they are here:
https://www.niap-ccevs.org/Product/
Only two EMMs are through the process entirely, Samsung's EMM, and MobileIron (Along with Apple's Device Agent). The rest are 'ongoing' and can stay in that state for a long time. But they will be eventually removed if they do not receive their validation.
These are the basis for the NSA CSfC list, and represent independent validation of the security of the devices or systems.
The Secure BlackBerry devices of the past used third party crypto from a company called KeyW. The newer BB10.3 devices may satisfy the requirements on their own, I have not personally read their Security Target or their Certification.