A 21-year-old Army veteran was shot to death Sunday only months after his return from Afghanistan, police said. Francisco Garcia had left a party at his girlfriend’s house and was on a sidewalk in the San Fernando Valley around 2 a.m. Sunday when two cars pulled up. A man got out of one vehicle, smashed a beer bottle on the ground and yelled at Garcia before going back to the second car to grab a gun, police said. Garcia died at the scene. No one else was injured. …