Dr J. Allen Hynek acted as scientific adviser to UFO studies undertaken by the U.S. Air Force under three consecutive names: Project Sign (1947–1949), Project Grudge (1949–1952), and Project Blue Book (1952 to 1969). For decades afterwards, he conducted his own independent UFO research, developing the Close Encounter classification system, and is widely considered the father of the concept of scientific analysis of both reports and, especially, trace evidence purportedly left by UFOs.
Marina Vasilieva Soviet Air Force pilot, a military test pilot. Honored as Hero of Socialist Labor, the Order of Courage. Marina Popovich wrote a book called UFO Glasnost where she has mentioned over 3000 UFO sightings by Soviet military and civilian pilots. Although qualifying that her statements are not official, she says that the Soviet Air Force and KGB have fragments of five crashed UFOs in their possession.