ufo sightings explained as experimental SR-72 and XB-70 platforms
Most likely answer in my opinion is that human inventors have some experimental vehicles that are so secret that even the regular Navy is unaware of their existence. Do we really believe the SR71 and the F117 were retired with no replacements entering service? These vehicles could be far more maneuverable than anything Naval aviators have seen. And as for making high G maneuvers, simple answer is they are unmanned. I sleep better at night believing that the US military is flying these unidentified flying objects. That's my humble opinion Turbine Based Combined Cycle (TBCC) NASA has funded a parametric design study by Lockheed Martin to establish the viability of a Turbine Based Combined Cycle (TBCC) Propulsion system consisting of integrating several combinations of near-term turbine engine solutions and a very low Mach ignition Dual Mode RamJet (DMRJ) in the SR-72 vehicle concept. The SR-72 would fly at speeds of Mach 6.0. ...