great documentary on ufo government secrets
Part 1

Part 2

Another good video about the history of the US military and ufos
unfortunately i can't embed this one as well
click here to view

very interesting the best collection of ufos over latin america
click here to view

Ever wonder how ufos fly and why they seem so flimsy in the sky? - This Quite interesting documentary aired on the history channel about the physics and engineering of ufos, strangely the ideas point to a gravity based propulsion system uncannily like the one proposed by the highly controversial bob lazar
Part 1

Part 2

Part 3

Part 4
Part 5
Part 6
Part 7
Part 8
Part 9
Part 10

Don't know mucha bout this one but good footage