I read it about 2 years ago. Couldn't tell you whether or not it was accurate.
I do know for a fact that one of our Fallen Marines from Grit's, Tommy Slocum, was in that battle and is mentioned in the book.
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Watch your thoughts, they become words.
Watch your words, they become actions.
Watch your actions, they become habits.
Watch your habits, they become character.
Watch your character, for it becomes...your destiny.