The president's helicopter is known as "Marine One", which is generally a Sikorsky VH-60N.
You can read more about it at the Navy's website:
http://www.navy.mil/navydata/fact_display.asp?cid=1200&tid=900&ct=1
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When the President of the United States flies in an airplane, the official air traffic control call sign is Air Force One. The U. S. Air Force is responsible for operations and maintenance of these jets, hence, the "Air Force" call sign. Conversely, the helicopter which flies the President is handled by the U.S. Marine Corps. When the President flies in the helicopter, the air traffic control call sign is "Marine One".
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Just as any airplane on which a U.S. President travels is referred to as Air Force One for the duration of the flight, any helicopter on which a U.S. President travels is referred to as Marine One.
Franklin D. Roosevelt
The United States has never had a President with the name of David.
There have been no U.S. Presidents whose last name started with S.
The four living former US Presidents are: 1. Jimmy Carter 2. George HW Bush 3. Bill Clinton 4, George W Bush
No US presidents were named Nathaniel.