Possible Clues:

• Jap. island (Nineteen forty five battle)
• Starting in World War Two, one Japanese island made American
• I walk over with fellow visiting a Japanese island
• Pacific island (WW2 battle)
• Where 'Uncommon valor was a common virtue': Nimitz
• WWII battle site
• Site of a famous flag-raising
• Pacific battle site in WWII
• Pacific island known for World War 2 battle
• Island almost won by lucky man before a battle