Staff Sgt. Christine Roberts, 317th Airlift Squadron loadmaster, discusses various checklists during her performance evaluation with Senior Master Sgt. Randy Thigpen, 317th AS, prior to take off June 13, 2015, at Joint Base Charleston, S.C. during a humanitarian aid mission to Haiti, Saint Kitts and Nevis. Aircrew members are evaluated on their job performance every 15 months. (U.S. Air Force Photo / Senior Airman Tom Brading)