My boyfriend will soon be graduating from USMC boot camp, what would be some good graduation gift ideas?

Navy Boot Camp graduation gift ideas?

My boyfriend and I are going to our friend’s Navy Boot Camp graduation soon. What are some good gift ideas?
We were going to get him a Navy Zippo Lighter but he’s stopped smoking and says he won’t smoke again after boot camp… I guess he could use it to light a candle. Ha.
IDEAS!?