“In bootcamp you learned out of a book. Out here you got to remember the book and learn a thousand things that have never been printed, probably never will be. You got to learn right, and you got to learn fast. And any man that doesn’t want to cooperate, I’ll make him wish he hadn’t been born. Before I’m through with you you’re going to move like one man and think like one, if you don’t, you’ll be dead. Now you guys have had a nice easy day, I hope you enjoyed it because it’s the last one you’re going to get for a long time. You joined the marines because you wanted to fight, well you’re going to get your chance and I’m here to see that you know how.” —John Wayne as Sergeant John M. Stryker in Sands of Iwo Jima (1949) John Wayne’s portrayal of Sgt. Stryker is a masterclass in grit and leadership. Though his squad resents his brutal training methods, the realities of Tarawa and Iwo Jima prove he was preparing them for survival — not just war. It’s a powerful reminder that tough lesson...