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 U.S. Department of Defense Office of the Inspector General informed the 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. “Our objective is to determine whether the U.S. Air Force complied with the Launch Services New Entrant Certification Guide when certifying the launch system design for the Evolved Expendable Launch Vehicle-class SpaceX Falcon 9 and Falcon Heavy launch vehicles.”

The memorandum does not explain why the inspector general believes such an evaluation is necessary. Signed by Deputy Inspector General Michael Roark, the memorandum only states that the evaluation will take place at the Space and Missile Systems Center, which is headquartered at Los Angeles Air Force Base in El Segundo, California. This is just a few miles from SpaceX’s headquarters in neighboring Hawthorne.