After serving tours in the Middle East, it was a Brooklyn backyard barbecue that proved deadly for Sergeant Kidson George. The 26-year-old man was gunned down on the porch of a Crown Heights home where he was celebrating the 4th of July with his girlfriend and others. George was shot twice in the chest by his girlfriend's former boyfriend, sending children screaming and dashing for cover. An unidentified 27-year-old woman was hit by a stray......