Presidential Encounters

S1, E1: From Truman to Obama, our modern day Presidents have all had rich and controversial histories with UFOs and extraterrestrials. In fact, Eisenhower, Nixon, Carter, and Reagan are each rumored to have had personal encounters. Inside HANGAR 1, MUFON files ask, "What do our presidents really know about the existence of UFOs?" Are some Presidents kept in the dark because they aren't trusted with that knowledge and how they might use it? Or, are they all aware, but the secrets are too dark and deep that full disclosure becomes a risk they just can't take?