AVClub: There are so many striking moments in “Soldier Boy” that it would be difficult to list them all. Lee’s whistle as he walks through the book depository. Doctor Al’s bloody cough into his pristine handkerchief. Sadie seeming to appear in the car out of nowhere. The Yellow Card Man actually appearing in the car out of nowhere. A smear of red on a car’s hood. A wrinkled report card. The briefest spasm of grief that crosses Deke’s face. That’s just scratching the surface.