Since I see this all over Twitter, I just want to point out...
Trying to disable a tank by shooting paint guns at the optics is stupid, won't work and will only waste live unnecessarily. The range on a paint gun is too limited, you'd have to spend FAR too long in range of their guns (which will effectively kill you) to completely cover all of the optics and it would take a squad sized element to be able to disable one that way...and they would all die. Completely inefficient method of disabling a tank.
And after you're dead, the TC or loader (corrected because I typed gunner for some reason, they can't get out unless the TC moves) climbs out (safely because you are dead) and wipes the paint off the optics.