Interplanetary Phenomenon Unit
The Interplanetary Phenomenon Unit (IPU) was reportedly a U.S. Army intelligence unit tasked with UFO crash retrieval and analysis operations in the late 1940s and 1950s. The unit's existence is confirmed through Army FOIA responses stating it was "disestablished in the late 1950s," though all records were allegedly transferred to the U.S. Air Force in conjunction with Project Blue Book.
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Official Acknowledgment
In 1980, researcher Richard Hall filed a FOIA request with the U.S. Army regarding UFO intelligence records. Colonel William Guild, director of Army Counter Intelligence, responded that the IPU "was disestablished in the late 1950s and never reactivated," and that all records were "surrendered to the US Air Force Office of Special Investigations with Operation Blue Book."
Subsequent FOIA requests by William Steinman (1984) and Timothy Good (1987) received identical responses, confirming the Army's institutional memory of the unit while claiming no records remain. According to Lieutenant Colonel Lance Cornine, the IPU was formed as an "in-house project as an interest item for an assistant chief of staff for intelligence" and "never had a unit or formally recognized mission or authority."
Alleged Function
According to William Steinman's sources, the IPU operated out of Camp Hale, Colorado and served to "collect and deliver disabled or crashed discs to certain specific secret locations." Steinman's 1986 book claims the IPU was the on-site military team that secured the 1948 Aztec UFO Crash Retrieval under the direction of General George C. Marshall.
Alleged IPU documents leaked to researcher Timothy Cooper describe field teams consisting of a commanding officer, non-commissioned officer, an aeronautical engineer, a scientist, a security officer, and a medical doctor — suggesting a standardized crash retrieval protocol.
Connection to MacArthur and Marshall
Researcher John Frick reported seeing Defense Central Index of Investigations (DCII) computer printouts from the early 1980s that listed "01 Interplanetary Phenomenon Unit" as the first line, allegedly under the command of General Douglas MacArthur.
MacArthur's G-2 (intelligence chief) was Colonel Charles A. Willoughby, who later became chief of MacArthur's intelligence staff. However, some researchers including Timothy Good suggest the IPU operated under someone of even higher rank — MacArthur's immediate superior, General George C. Marshall, Army Chief of Staff and later U.S. Secretary of Defense.
Skeptical Counter-Arguments
Researchers Brad Sparks and Kevin Randle argue the "IPU" was merely a misremembered designation for the Input Processing Unit of Army Intelligence, later the Army AFSTC Foreign Science and Technology Center — essentially a documents mail room. They claim the unit handled receipt and forwarding of UFO reports in the post-Sputnik space era and had no operational crash retrieval function.
However, this interpretation does not account for the specific wording in Army FOIA responses or the DCII database entries associating the unit with "interplanetary phenomena."
Majestic Documents Connection
Two documents allegedly from the IPU appear in the Majestic Documents collection: an IPU Field Order dated July 4, 1947 directing a team to a UFO crash site at Roswell, and an IPU Report dated July 22, 1947 detailing the recovery of multiple craft and mentioning scientists including Dr. J. Robert Oppenheimer and Dr. Detlev Bronk — both also connected to the Aztec case.
These documents were provided to researcher Timothy Cooper by Thomas Cantwell between 1993-1996, predating William Steinman's published theories but mirroring many of his conclusions.
Special Engineer Detachment (SED) Personnel
An alleged IPU report dated July 22, 1947 mentions Colonel Sherman V. Hausbrook of the Armed Forces Special Weapons Project (AFSWP) ordering a "special radiobiological team, accompanied by a SED and a security detail from Sandia National Labs" to secure the immediate area surrounding the Roswell crash site. Colonel Hausbrook was a real Army colonel who worked closely with Leslie Groves and helped flesh out the AFSWP. The Special Engineer Detachment (SED) was a genuine Manhattan Project artifact — an Army unit designation for military personnel with scientific and technical backgrounds assigned to work on the atomic program at sites including Los Alamos, Z Division at Sandia Base, and Oak Ridge. The alleged IPU report's reference to SEDs operating on a UFO crash retrieval is consistent with the Manhattan Project 2.0 framework, in which UFO programs directly borrowed organizational structures from the atomic program.
George C. Marshall's Alleged Leadership
UAP Gerb's investigation — drawing on research by Ryan S. Wood and the late Robert Wood — presents the theory that the IPU's real leadership was George C. Marshall himself, compartmented within a subordinate G-2 (assistant chief of staff for intelligence) office to remove him from the formal chain of command. This interpretation is structurally consistent with Marshall's known practice during the Manhattan Project of using his G-2 to conduct covert intelligence missions (the Alsos Missions), and with the IPU's alleged function as a rapid-reaction crash retrieval apparatus operating outside normal military intelligence channels — precisely the architecture Marshall developed for the Alsos Missions.