ars technica: The report considers noise and other effects from landing up to three first stages at the same time. by Eric Berger
'After undergoing a preliminary review by the US Air Force, the document has been released for public comment.
'First reported by NASASpaceFlight.com, the document offers some interesting details about the proposed launch and landing of SpaceX's heavy lift rocket, which the company hopes to fly for the first time in the spring or early summer of 2017.
'After previously demonstrating the ability to land a single Falcon 9 booster, SpaceX also hopes to land the three first-stage boosters that will power the Falcon Heavy for potential re-use.'