Harry Truman
Serving as President of the United States at the time of the time of the Roswell Incident in 1947, there are unconfirmed reports that Truman visited the site.
Harry S. Truman was the 33rd president of the United States. He served from 1945 to 1953, during a period of heightened public interest in "flying saucers". Experts have long speculated about Truman's involvement in the Roswell incident, as well as his role in shaping early U.S. Air Force investigations into the phenomenon.
Although the National Security Act that established the National Military Establishment, Secretary of Defense, Department of the Air Force, and Central Intelligence Agency was passed shortly after the Roswell incident, Truman initially proposed the legislation in 1944 while a U.S. Senator from Missouri. The Truman library has not found any references to "flying saucers" in the Truman public papers, but he certainly was briefed on government studies as U.S. Air Force investigations began during his time in office.
Some Ufologists alleged that Truman created a secret organization called the "Majestic 12" to deal with the phenomenon, but no proof has ever been provided and the FBI has declared some Majestic 12 documents as "completely bogus." At the end of the Truman presidency the Robertson Panel, a scientific committee that was organized by the CIA, convened and established a new government policy to limit media attention to the UFO phenomenon and "reassure the public of the total lack of evidence of inimical forces behind the phenomenon."