Possible Hunter Origins - Vigil Operator
Along with the mask similar to the Hunters, Vigils disrupts surveillance equipment and is invisible on video feeds.
His release into R6S was in the expansion "Operation White Noise".
Rainbow 6 Siege is also a Tom Clancy game just like the Division, and it's not crazy to think some of these Tom Clancy games are apart of the same world, like how Ghost Recon Wildlands and Splinter Cell are.
So Hunters could be the South Korean 707th Special Mission Battalion (SMB).
Rainbow 6 Siege wiki - Vigil Description
http://rainbowsix.wikia.com/wiki/Vigil
1 minute video. Watch and say what you think.
https://www.youtube.com/watch?v=9yyoJtj_7Mk