Tracy L. DeMarco, a photojournalism instructor at the Defense Information School on Fort Meade, helps Basic Photojournalist Course-Air Force students Staff Sgt. Tim Mesko, left, and Senior Airman Rana B. Franklin, center, with a studio photography assignment April 22, 2016 at the school. DeMarco, who retired in 2012 after 20 years in the Air Force, joined the DINFOS staff in February to teach photojournalism.