Some decades ago 12 military personnel travelled to Zeta Reticulum and returned to Earth months or years later. I guess they travelled with the Aliens and their spaceship. This classified information remains hidden, like many other information. But why is this part of information known? Is this a lie or a rumour?
I think there is a possibility that some military personnel went with the Greys Aliens to their planet. Some of them are very kind and take certain humans to outer space. Many years ago an Alien showed a star map of Zeta Reticulum to a woman, as she asked from where he is from. Another time an Alien travelled with a human woman to the Moon and took her back to Earth after a few hours.
Do you have more information about project Blue Book? Do you think it's true? Do you have other similar information?