The laser will be low power and cause no damage. The idea is to test the laser targeting system. By doing it on a moving NKC-135, the test can be repeated many times.
Aha! Another voice of sanity. Are you, perchance, some sort of engineer?
"doing it on a moving NKC-135, the test can be repeated many times."
OK, but doens't a missile move slightly faster than a KC-135?