“Unbroken” by Laura Hillenbrand. The life story of an American hero, Louis Zamparini, and absolutely one of the most inspiring books I’ve ever read. If you aren’t familiar with this one already, just buy it and start reading. Don’t even read the synopsis first; let the whole thing be a surprise. :)
Wikipedia says that Zamperini was held in the same camp as Pappy Boyington.
I recommend Boyington's book, Baa Baa Blacksheep. In addition to being an interesting account his WWII experiences, it includes a helpful message to anyone struggling with substance abuse.