Bill Cosby
Now, what is this man known for? Well, Bill Cosby is famous for The Cosby Show, of course! But prior to making everybody laugh with his smart comments, he used to be a hospital corpsman in 1956 for the US Navy! Bill offered his services to care for deeply injured Korean soldiers in the physical therapy department.
Bill provided his serviceability to the country for four years, and in 2011 at the Navy ceremony, he was even appointed as an honorary chief officer! However, since then, life has taken a turn for Cosby, and he is currently serving time.