Edgar Mitchell

Edgar Mitchell (c. 1931-2016) was an Apollo astronaut, founder of the Institute of Noetic Sciences and UFO conspiracy nut. He is the only astronaut who has publicly divulged LSD experimentation, although his post-lunar beard was not nearly as fetching as Transcendental Meditation practitioner Rusty Schweickart's Skylab-era shag 'n' chops.

Mitchell has never claimed, or even hinted, that he saw anything alien on the Moon, on the way to the Moon, or on the way back from the Moon. He has never even said he's seen an alien on Earth, despite having been raised not far from Roswell. However he has said many times that he's been briefed by senior military officers and knows that alien visitation is an established fact. Other UFO believers love him, because they think that his claims are "insider info".

On aliens
From an NBC interview on April 19, 1996: