Army One is the callsign of any United States Army

United States Army

The United States Army is the main branch of the United States Armed Forces responsible for land-based military operations. It is the largest and oldest established branch of the U.S. military, and is one of seven U.S. uniformed services...

 aircraft carrying the President of the United States. From 1957 until 1976, this was usually an Army helicopter transporting the President. Prior to 1976, responsibility for helicopter transportation of the President was divided between the Army and the U.S. Marine Corps

United States Marine Corps

The United States Marine Corps is a branch of the United States Armed Forces responsible for providing power projection from the sea, using the mobility of the United States Navy to deliver combined-arms task forces rapidly. It is one of seven uniformed services of the United States...

 until the Marine Corps was given the sole responsibility

Marine One

Marine One is the call sign of any United States Marine Corps aircraft carrying the President of the United States. It usually denotes a helicopter operated by the HMX-1 "Nighthawks" squadron, either the large VH-3D Sea King or the newer, smaller VH-60N "WhiteHawk", both due to be replaced by the...

 of transporting the President by helicopter.

A famous photographic image of Army One was taken on 9 August 1974, when President Richard Nixon

Richard Nixon

Richard Milhous Nixon was the 37th President of the United States, serving from 1969 to 1974. The only president to resign the office, Nixon had previously served as a US representative and senator from California and as the 36th Vice President of the United States from 1953 to 1961 under...

 delivered his V sign

V sign

The V sign is a hand gesture in which the index and middle fingers are raised and parted, while the other fingers are clenched. It has various meanings, depending on the cultural context and how it is presented...

 just before leaving office in the wake of the Watergate scandal

Watergate scandal

The Watergate scandal was a political scandal during the 1970s in the United States resulting from the break-in of the Democratic National Committee headquarters at the Watergate office complex in Washington, D.C., and the Nixon administration's attempted cover-up of its involvement...

. Although he had written his letter of resignation, it had not yet taken effect, so he was still President. Lt. Col. Gene T. Boyer, President Nixon's Chief Helicopter Pilot, secured the President's VH-3A "Sea King" helicopter, tail number 150617. The helicopter is on permanent display outside the Richard Nixon Presidential Library and Museum. This specific helicopter was in the Presidential fleet from 1961 to 1976, transporting Presidents Kennedy, Johnson, Nixon, and Ford, and many foreign heads of state and government. Lt. Col. Boyer flew President Nixon on his final flight from the White House to Andrews Air Force Base on 9 August 1974.

Wherever Army One flies, it is met on the ground by at least one soldier in full dress uniform

Dress uniform

Dress uniform , is the most formal military uniform, typically worn at ceremonies, official receptions, and other special occasions; with order insignias and full size medals...

.

An Army aircraft carrying the Vice President is designated Army Two.