Jon CrossleyJon Crossley is a senior warrant officer in the Royal Air Force. He served as Chief of the Air Staff's Warrant Officer from 2016 to 2019.Military careerCrossley joined the Royal Air Force in November 1985. He trained as a plotter air photographer at RAF Wyton. From June 2014 to October 2016, he served as Station Warrant Officer of Royal Air Force College Cranwell.