Marine Helicopter Squadron One (HMX-1) HMX-1 Insignia Type of Activity Presidential Transport Location Location Worldwide Date of Activity Dec 1947-Present Coordinates 38°53'51.2"N 77°02'20.9"W
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| Major Barrett departs the White House with President Eisenhower on July 12, 1957 for Camp David. |
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| During his second term, Eisenhower used a Bell UH-13J Sioux to fly to the Presidential retreat at Camp David and to his farm in Gettysburg, Pennsylvania |

A retired,
de-militarized, and restored VH-3D Marine One was officially inducted into the
George H. W. Bush Presidential Library and Museum, College Station, Texas on 12
June 2024. Bureau number 159358 (BUNO 358) served United States presidents
beginning with the Ford administration. The library and museum, located within
the Texas A&M University campus unveiled the VH-3D inside the new pavilion
that now houses the retired Marine One on what would have been President George
H. W. Bush's 100th birthday.
| Retired Marine One Finds Permanent Home at Presidential Library and Museum |
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| HMX-1 V-22 Osprey |
| Construction of the new helipad on the south lawn of the White House |
A Permanent Solution
Rather than continue repairing the lawn after every landing, the administration approved construction of a permanent granite helipad.“It’s got the seal of the White House on it in carved granite,” Trump said. “It’s really a beautiful thing.”
According to the President, Sikorsky Aircraft, a subsidiary of Lockheed Martin, agreed to pay the entire cost of the project because the company recognized the operational challenges created by the new helicopters.
A Long-Needed Improvement
The U.S. Marine Corps currently operates 10 VH-3D and six VH-60N, and 9 VH-92A helicopters. All models are military certified aircraft modified to perform the mission.
The VH-3Ds were placed in
service in 1974 and the VH-60s entered service in the 1980s. Both legacy
aircraft have exceeded their original twenty-year service life expectations due
to a comprehensive three-year overhaul cycle.
The tradition of Marine One continues today, Combined,
these
aircraft
enable the Marines of
Marine Helicopter Squadron One to
provide only the finest
service for the President of the
United States.
| Sikorsky VH-92A Patriot Although the aircraft is based on the commercial S-92, presidential requirements added considerable weight in the form of secure communications, self-protection equipment, specialized wiring, and redundant mission systems. Every added pound increases the power required during hover and landing, which in turn increases rotor thrust and the volume of air accelerated downward through the rotor disc. Understanding Rotor Downwash Every
helicopter remains airborne by forcing a large column of air downward. This
moving column of air, known as rotor downwash, creates the lift needed to
support the aircraft’s weight. The
heavier the helicopter and the more power applied by its engines, the greater
the volume and velocity of this downwash. During landing, especially in
confined areas such as the White House South Lawn, the rotor system creates a
concentrated stream of high-energy air that strikes the ground before spreading
rapidly in all directions. This
airflow is strong enough to lift loose debris, move gravel, scatter landscaping
materials, and flatten vegetation. On grass surfaces, the combination of
aerodynamic force and engine heat can remove moisture from the soil, damage
root systems, and literally tear the turf from the ground. The effect is even
more pronounced when a helicopter hovers for several seconds before touchdown
or after liftoff. Why the VH-92A Damages the White House Lawn The
principal issue is not simply rotor downwash, but the interaction between the
rotor wash and the helicopter’s exhaust system. The
older VH-3D Sea King, which entered presidential service in the 1970s, routes
much of its engine exhaust outward and away from the ground. While the aircraft
still generates substantial downwash, relatively little extremely hot exhaust
is driven directly into the landing surface. The
VH-92A, however, is derived from the commercial S-92, whose engine installation
places the exhaust outlets farther aft and closer to the rotor system. During
hover, the main rotor forces the hot exhaust plume downward where it mixes with
the rotor downwash before striking the ground. The result is a concentrated
blast of high-temperature air capable of scorching grass almost immediately
under certain wind and atmospheric conditions. This issue became significant
enough that landing-zone suitability for grass surfaces was identified as one
of the program’s remaining technical challenges, prompting engineering
modifications to the rotor system intended to reduce heat damage while the
rotors are turning. Landing Loads and Why a Level Surface
Matters Another
advantage of a permanent helipad is structural rather than aerodynamic. When
a helicopter touches down, its landing gear and shock struts are designed to
absorb the aircraft’s weight evenly. If the landing surface is uneven or
sloped, one landing gear may compress before the others, increasing structural
loads on the airframe and rotor mast. The White House South Lawn has a noticeable slope away from the South Portico. While experienced Marine One pilots have operated safely there for decades, a perfectly level granite landing surface distributes landing loads more uniformly through all three landing gear, reduces side loading on the struts, and minimizes stress on the aircraft during repeated operations. A former Marine One pilot has noted
that equal compression of the landing gear improves stability during touchdown
and provides the safest possible landing environment for both crew and
passengers. Granite
offers several operational advantages over grass. It provides a rigid, level
surface that will not rut, settle, or erode under repeated helicopter
operations. Unlike gravel or asphalt, properly finished granite produces
virtually no loose debris that could become dangerous foreign object damage
(FOD) when caught in rotor wash. The stone also tolerates repeated exposure to
hot exhaust without deterioration and requires far less maintenance than
constantly repairing sections of damaged turf. Because the landing area remains
dimensionally stable over time, pilots also benefit from a consistent visual
reference during every approach. For
these reasons, permanent helicopter landing facilities at military
installations, hospitals, offshore platforms, and executive transport
facilities are almost always constructed from reinforced concrete or stone
rather than maintained turf. In
many respects, the White House granite helipad brings presidential helicopter
operations in Washington into line with long-established aviation engineering
practices. Rather than serving as a cosmetic improvement, it addresses
aerodynamic, structural, and operational issues that have become increasingly
apparent with the introduction of the more capable VH-92A Patriot. |






































