As incredible as it may sound, there are numerous presidents, politicians, high ranking military and world leaders that have either privately or publicly expressed their belief in the existence of the UFOs or have at least commented on them. General Douglas McArthur, for example, believed at one point that the UFO were about to invade Earth. General Mc Arthur became interested in UFO when they were known as Foo-Fighters. MacArthur was allegedly involved in the creation of an Interplanetary Phenomenon Unit (IPU) after the 1942 Los Angeles Air Raid involving UFOs. The IPU’s existence was eventually confirmed by Army responses to FOIA requests in 1984. Given MacArthur’s alleged role in the IPU, he was aware of official military records concerning UFOs. During World War II, General Douglas McArthur learned first hand that something pretty strange was going on when many Allied pilots reported that their bombers were being followed on a regular basis by some mysterious balls of glowing light that seemed to be under intelligent control. Initially, the reports were classified because the military suspected that the disk could be a secret German aerial device. According to writer John Keel, MacArthur realized the significance of the matter when, during the summer of 1946, he was personally called upon to examine reports coming from Sweden and Norway of unexplained “Ghost Rockets” that seemed to be plaguing the sky over those Scandinavian nations.   MacArthur felt these were not Japanese or German Aircraft, reconnaissance devices or secret weapons. He based that opinion on the fact that intelligence reports indicated that Japan Pilots were experiencing the same phenomenon and had no idea what they were. As a result of that information, MacArthur ordered an investigation into the Foo Fighter encounters in the Pacific.  Since Allied Pilots were already routinely debriefed after their missions, it didn’t take a great deal of time or effort to ask those that spotted Foo Fighters a few extra questions or have them make drawings of what they saw. That information became the foundation for MacArthur’s Report. Some of the “Ghost Rockets” may have even crashed, and it’s possible that MacArthur was among the first to examine wrecked alien craft. (Timothy Green Beckley, UFOs Among the Stars, p. ?) 
After the war ended, captured Japanese war records confirmed that the Foo Fighters had also been seen by Japanese and German Pilots wherever they flew. It certainly wasn’t a phenomenon limited to the South Pacific. The Germans even told the Japanese that they could not be American aircraft or observation devices because they had managed to down or capture some. After examining litteraly hundreds of those reports the General became convicted that some unearthly power was behind the observation of cigar-shaped craft that often hovered and then shot across the sky at what were then considered to be fantastic speeds. The Germans believed the technology they found inside these unknown objects was way beyond anything humanly possible at that time. While this might have been more bragging then fact, it does coincide with documents later found in Axis war files by the CIA that indicated the Germans had captured UFOs during the war and were trying to reverse engineer them. By the time it was finished in the late 1940s, McArthur’s Report on the Foo Fighters was over 10,000 pages long. That may not sound like much in terms of government paperwork, but that was merely the information collected. Descriptions and drawings were included without any additional comments. The sightings and encounters hadn’t ended, but there was simply no more time or funds for further investigations as far as that particular report was concerned. MacArthur was convinced the devices described in the report were of unknown and possibly extraterrestrial origin. Before it was even completed, the report was classified to prevent it from falling into the hands of our allies or enemies. The Joint Chiefs were provided with copies of the report while it was still a work in progress and were said to be greatly concerned about the content. We can seriously doubt that it was shared with the CIA or any other intelligence gathering services inside or outside of the U.S. Government.
Once in the private sector, MacArthur began to collect reports of UFOs and read up on the subject. Several times durng the end of his life, he made some fairly “far-fetched” statements about unidentified flying objects.”  Among others, in october 1995, as repoted by the New York Times, MacArthur told an audience this stunning revelation:
The nations of the world will one day have to unite – for the next war will be an interplanetary war […] The nations of Earth must someday make a common front against attack by people from other planets. 
Later, at an adress he have at West Point Military Academy in 1962, MacArthur repeated his rather bleak forecast when he stated:
We speak in terms of harnessing the cosmic energy… of ultimate conflict between a united human race and the sinister forces of some other planetary galaxy… 
Supposedly, it was General MacArthur who first briefed Harry Truman on the importance of the Government’s ongoing efforts to monitor UFO activity. According to Timothy Green Beckley, “following the crash of a space ship outside Roswell, new Mexico, in July of 1947, every U.S. President since has been fully informed about UFOs once he has taken office, despite the fact that before being elected, they have been kept in the dark like everyone else. ”  This is the reason why, according to him, that “promises of some presidential candidates to be more forthcoming about UFO after being elected have faded in the inaugural glow” and that “reminders of these promises later on were almost always ignored.”  Although many of the commanding officers serving in the military hierarchy in Washington, D.C. did not particularly like or admire General MacArthur, they knew it would a mistake to ignore anything he passed their way. Most either dismissed or could not intellectually accept MacArthur’s extraterrestrial theory about the origin of the Foo Fighters, but not all.
General Hoyt Vandenberg served as the Air Force Chief of Staff from 1948 until 1953 and died in 1954. Vandenberg was extremely concerned about all things UFO and hated Project Blue Book with a passion. He believed that UFOs could become a serious threat to national security and despised wasting Air Force time, money and personnel on a half-hearted investigation like Blue Book. Despite what seemed like a honest endeavor by Captain Edward J. Ruppelt to use the Blue Book team as a serious investigative effect into the UFO phenomenon during those days, he missed the point that it was never designed to accomplish that task. It was meant to placate public concern about the phenomenon and nothing more. Either way, Vandenberg had other ideas. A lot of people think that Vandenberg knew everything the government could have known about UFOs and Aliens in the late 1940s and early 1950s. He and other military leaders used the power given to them by the creation of the National Security Act of 1947 as a springboard to secretly exercise control over the extraterrestrial situation. MacArthur was a warrior and a patriot, but no friend of secret government agencies or military alliances on power trips. He once said, “I am concerned for the security of our great Nation; not so much because of any threat from without, but because of the insidious forces working from within.” It would be logical to believe that this attitude placed him out of the loop when it came to actual decisions regarding the military and UFOs that didn’t directly involve his command. Vandenberg had been the U.S. Chief of Military Intelligence during World War II, served as Air Force Chief of Staff and Director of the CIA among other things. That made him the king of the mountain when it came to UFO information during and after World War II. His son, Major General Hoyt S. Vandenberg Jr, may have felt the same way his dad did about UFOs and Blue Book. It seems that he was also disgusted at the Blue Book findings and how they embarrassed the Air Force. As of the evidences that were put into writing, the government will not acknowledge that any report by General MacArthur regarding Foo Fighters or UFOs exists or ever did exist. Without knowing that designation, it would be nearly impossible to track down any related documents that might lead to the larger Report as a whole. Most wartime documents involving MacArthur are still classified anyway.