I need some help...

As I have been playing, I have noticed a number of people who are using camo, but they are not on the radar. Instead, when they move, they become a red diamond, then turn to a blue diamond which fades. How does one do this?

When using active camo it also activates a radar jammer for both the user and enemy.

Wetwork specialization helps with Camo making it harder for the motion tracker and PV