Air Force Senior Airman Marquis D. Waters, right, and Staff Sgt. Ana Nichols, center, carry a human simulator mannequin onboard a KC-135R Stratotanker at St. Croix, U.S. Virgin Islands, Aug. 26, 2017, for an aeromedical evacuation training mission over the Caribbean Sea. Waters and Nichols are aeromedical evacuation technician assigned to the 514th Aeromedical Evacuation Squadron, 514th Air Mobility Wing. Air Force photo by Master Sgt. Mark C. Olsen