Actually, the author, James Bradley, has written another book called "Flyboys" which is based on the island Chi Chi Jima, in the pacific as well.
I read this book first which is what lead me to Flags.
Flyboys is a good book as well, but quite [dare I say it, here she goes again!] Americanised!
Nine pilots are shot down and captured and it tells their story. It certainly opened my eyes to the horrors that some people are capable of.