Barring some unforeseen disaster, Army 1st Lt. Caleb Campbell will play his first NFL game when he runs out onto the field Saturday for the Detroit Lion’s first preseason game against the Pittsburgh Steelers. It’s a huge step for a guy that spent the last two years on active duty in the Army and far, far away from the world of professional football. Campbell did a few interviews recently where he said he kept his distance by choice. While the former 7th-round draft pick had no say in his NFL dream being abruptly put on hold by the Army in…