Government conspiracy misunderstanding.

I posted this in the Military/Government project section, but thought it should go here as well. Wasn't sure if everyone looks at the same threads.

I've been looking on this site for a while, and never really posted anything until I found that I was confused by some things. First off, I am not really sure if there are any other posts regarding this, but I was hoping that someone could state in one post the information I am curious about.

I am currently enlisted in the Marine Corps, and have seen a lot of strange crap go on around here on base that I am not authorized to discuss as per the non-disclosure agreement I had to sign when I got my clearance top secret. But nothing has ever made me think twice about aliens in affiliation with any form of our government. My question is, how are we (the US) affiliated with Aliens? I've been reading on ATS and other websites regarding this, but everything is just hear-say. Some "guy" who USED to work for Area-51 saw an Alien or a flying saucer and automatically, theres this world-wide conspiracy involving zeta reticuli who gives us technology that we have reversed engineered to create machines capable of anti-gravity, free energy, etc if we give them people to study. I've also heard something about the Reptilians who are the enemy of the Greys and have enslaved them years ago, and the Greys are trying to find peace on Earth. Whatever the case may be, I am just confused by this and the whole back story and reasoning behind it. I've been a believer on the whole thing for a long time, but I am coming to a dead-end on what could be fact and what is more than likely fiction.

Thank you.