Adding to the mystery, Menzel was named in the MJ-12 documents as part of Truman's top secret UFO research panel in the late 1940s.
These high-level programs launched by Truman were designed to unify psychological warfare efforts across US agencies.
Gray was also named as one of the advisors on the top secret research and development organization established by Truman as it appears in the leaked Majestic 12 documentation.
Allegedly, the Majestic-12 was a secret committee formed by President Truman in 1947 to handle the extraterrestrial issue.
MJ-12 was supposed to have been created at the same time the Truman administration was facing an entirely new existential threat, nuclear weapons.
It may have evolved in this period from a small Truman-era committee to a more structured program under Eisenhower, and elite think tanks like these may have served as its intellectual and strategic backbone.