On 8/3/20 Hornady announced they filled an additional DoD contract for 6mm ARC I believe it's for the TAP ammo 

7/23/20 
Hornady won a contract for an unspecified amount of 300blk TAP sub-sonic ammo for a DoD entity.  

Hornady have been busy selling a couple Boxs of ammo to the DoD ? I sure would like to find out who's using ARC.

Ya I'd like to know who and how there using the arc