An Italian air force boom operator looks through a helmet-mounted display, which displays three-dimensional imagery of the boom, while refueling an F-35A during a sortie Sept. 2, 2015. Boom operators onboard the Italian air force KC-767A tanker use a remote vision system, which consists of two stereoscopic cameras on the bottom of the tanker, in order to refuel. (U.S. Air Force photo/Jet Fabara)