At some point in our lives we all wanted to have the X-Ray vision of Superman. Perhaps our intentions were for more nefarious, or perhaps sexual reasons - but in Blacklight: Tango Down your x-ray vision (called Hyper-V) is built into your heads up display to give you a leg up on the enemy.
The latest trailer shows off this visor mode which gives you a quick glimpse of enemy locations and other important information. It should be pretty useful in the game's co-op mode for strategic attacks on the enemy. It's still unconfirmed if you can see the enemy - or your teammates - underwear.