They loom over him, brandishing their weapons, their gaze steady. The sculptor can feel the presence of the heroes he honors in clay and bronze, U.S. Navy SEALs all. And all of them gone. “I am an intuitive artist. I believe and I feel that their spirits are in the room when I am working, and that they’re helping me finish that work,” said Greg Marra, a Florida sculptor who is a man on a mission. He is determined to tell the stories of fallen American warriors. “I know it sounds crazy, but I feel their presence. That’s what happens...