A new investigation from The New York Times suggests that SpaceX founder Elon Musk has not been reporting his travel activities and other information to the Department of Defense as required by his top-secret clearance. According to the newspaper, concerns about Musk's reporting practices have led to reviews by three different bodies within the military; the Air Force, the Office of the Under Secretary of Defense for Intelligence and Security, and the Defense Department Office of Inspector General. However, none of the federal agencies cited in the Times article has accused Musk of disclosing classified material. The Times reports that Musk had a mid-level security clearance until 2018, at which point SpaceX applied for a top-secret clearance for its chief executive. SpaceX performs a number of functions for the US government, both civil and military branches. Among its most secretive activities are launching classified satellites for the National Reconnaissance Office and providing encrypted communications and observational activities with its Starshield satellites.