What happened
A light metallic blue object shaped like a pecan, about 10 by 5 feet, with a clear nose holding a door and rods or aerials, hummed, hovered and landed 50 feet away. A tall blond man got out, spoke in a language the guard did not know, patted him on the shoulder, climbed back in and strapped himself in. The object took off nose up, leveled out and climbed straight away, within two or three minutes.