Philip J. Corso (May 22, 1915 – July 16, 1998) was an American Army officer, and author of the book The Day After Roswell.
He served in the United States Army from February 23, 1942, to March 1, 1963, and earned the rank of Lieutenant Colonel. Corso was on the staff of President Eisenhower's National Security Council for four years (1953–1957).
In 1961, he became Chief of the Pentagon's Foreign Technology desk in Army Research and Development, working under Lt. Gen. Arthur Trudeau.
Corso published The Day After Roswell, about how he was involved in the research of extraterrestrial technology recovered from the 1947 Roswell UFO Incident. On July 23, 1997, he was a guest on the popular late night radio show, Coast to Coast AM with Art Bell where he spoke live about his Roswell story. This interview was rebroadcast by Coast to Coast AM on July 3, 2010.
In his book The Day After Roswell (co-author William J. Birnes) claims he stewarded extraterrestrial artifacts recovered from a crash near Roswell, New Mexico, in 1947.
Corso says a covert government group was assembled under the leadership of the first Director of Central Intelligence, Adm. Roscoe H. Hillenkoetter (see Majestic 12). Among its tasks was to collect all information on off-planet technology. The US administration simultaneously discounted the existence of flying saucers in the eyes of the public, Corso says.
According to Corso, the reverse engineering of these artifacts indirectly led to the development of accelerated particle beam devices, fiber optics, lasers, integrated circuit chips and Kevlar material.
In the book, Corso claims the Strategic Defense Initiative (SDI), or "Star Wars", was meant to achieve the destructive capacity of electronic guidance systems in incoming enemy warheads, as well as the disabling of enemy spacecraft, including those of extraterrestrial origin.