From the dust cover blurb:

   Yankee Samurai is about Americans of Japanese ancestry who served secretly in the Pacific, wielding a weapon unique to the war - language!
   They shortened that conflict by at least two years, saving over 1,000,000 lives, but the Pentagon sat on their story for nearly three decades. Only scraps of it were known until author Harrington began digging.
   The story is told, as with Harrington's other books - "in the words of the men who lived it." He reveals how Nisei turned the tide of battle on Okinawa, how they gave the U.S. Navy the greatest victory in its history, and other secrets.
   Only one word aptly describes this book.
   "Thrilling!"