Dozens of police officers lined the entrance to the Citrus Elementary School in Upland, California, to welcome the son of a slain officer on his first day of kindergarten on August 29.The child’s father, Greggory Casillas, was shot during a standoff with a fugutive on March 9, after working with the Pomona Police Department for six months, according to NBC Los Angeles. Credit: Pomona Police Department via Storyful