Enlarge / A view of the Falcon Heavy rocket on Monday, from one-quarter of a mile away. (credit: Trevor Mahlmann for Ars Technica) In a memorandum released Monday night, the US Department of Defense Office of the Inspector General informed Air Force leadership that it will evaluate the military's certification of SpaceX's Falcon Heavy for national security missions. "We plan to begin the subject evaluation in February 2019," the memorandum states.