Nope, that is us shining a laser through the back end of the telescope towards the moon. I haven't had the pleasure of being a spotter for them yet, but basically, they shine the big ass laser at the moon, and then sit back and wait for the light to bounce off the reflector and hit the telescope again. They can then time it and determine the distance to the moon.
eta: That green line is the actual laser beam itself. Its such a high powered laser, everyone is required to wear special safety glasses. We also have to have "spotters" who look out from the front platform of the telescope looking for planes. If we spot a plane, they shut down the laser until it passes.