The Air Force Academy Falcons football team released images of their alternate uniforms, which honors the Boeing C-17A Globemaster III, as part of their Air Power Legacy Series. The uniform is light grey, with "formation lights" markings and black numbers. The nameplate on the back of the jersey will reflect the tail flashes of nine C-17A units, including the 204th AS / 535th AS that is based at Joint Base Pearl Harbor Hickam. The helmet for the game is painted in the same grey as the aircraft, complete with squadron designation, "formation lights", and the refueling receptacle markings on the top of the helmet.
Further information and images in this Air Force Academy Football article.