Who is he? I really don't know if he's an actor o a real astronaut. Does anyone know his name?

This is Navy Rear Admiral Alan Shepard. He was the first of the original Mercury astronauts to go into space. He also walked on the moon during the Apollo 14 mission. He sadly passed away in 1998.

It looks like he might be a real astronaut, I know it has something to do with "Enterprise" I bet if tu look up "Enterprise NASA ships" tu might find information on the subject. :)