I bought it in paperback in 1976 and mailed off to (then) editor Nightowl for more info on NPL. I joined immediately along with a friend (Lionheart) who only lasted one year or so (but he went on to win a potful of money on Jeopardy!)
First Issue: May 1976
I used my nickname at the time I joined. I received it from my fellow basketball teammates, and it refers to my mobility on a basketball court.