I heard someone mention recently that this guy completely disappeared after this series of disclosures. This was his interview by Greer:
DIA Secrecy on UFOs – John Maynard, Defense Intelligence Agency / Disclosure Proj. Testimony Archive
“John Maynard was a military intelligence analyst for the Defense Intelligence Agency. In the course of his 21 years career he saw evidence of the military’s interest in UFOs in a variety of ways: electronic communications which did not originate from earth; military photos of UFOs. While at the DIA, he became familiar with the compartmentalization process of maintaining secrecy. He saw spy plane photos with clear UFOs in them.