Perserverance!
I couldn't be happier for your dad. As I read it there were two sucess stories. First I'm glad he was able to get his weight down. That can be a tough battle in itself. Then 18 years is a loooong time to go in a dry spell. I'm glad he was able to get it to all come together and get an arrow in his deer. I'm sure he'll be hooked for life now(not that he wasn't for the last 18 years)
My hats off to him