The evidence is mounting of an organized military unit that was used in the Las Vegas massacre. The organization and tactics involved indicate a well financed and purposeful crime. This video shows the presence of at least two helicopters that flew over Mandalay Bay and one landed on the roof after the shooting to make the extraction after the event.
This explains why the Las Vegas sheriff looked distraught at the press conferences with the FBI agent (related to Nick Podesta) stood next to him. This is getting deep folks.