To the Grey
Maybe if you went to some other planet you would land and meet them and not sneak around.( I guessing that you called ahead first and made an
appointment with the planets leader

)
But on a maor serious note, with the state of the affairs the world is in at the moment I Guarantee that the military would not be walking onto
a strange planet happy faced and hugs aplenty.
Because even if the world somehow became a unified planet America would still want to be in control, and when they found another planet that
contained Inteligent life I'm sure they would send a scout craft first(just like mars)to check the surroundings out probably what are doing here.
As for abductions Its just gathering information, just like the Military Inteligence