recon laser designate targets that sustain damage

HOW TO DO IT. 

I was able to get progress even using the tracker dart on a vehicle right before it explodes, but to consistently get it filled up is to set down your laser designator on top of the crane on Mirak Valley then go hide. and remotely use it to paint targets, once you paint a few tanks, jets, and a Heli, make sure you go out of the remote view where your just holding your gun. wait for a teammate to shoot and destroy your painted target, then go back into remote view and paint again, remember it will count every time if you paint a few and then back out of the soflam remote, its best to place it down instead of binoculars