House Military Office. Whiteside, although based at Quantico, Virginia, operates extensively out of an adjunct facility at Joint Base Anacostia-Bolling in Washington, D.C. Operations by "Greenside", which is the rest of HMX-1, include operational test and evaluation, such as with the V-22, a vertical take-off and landing tiltrotor aircraft, and support of exercises and training evolutions for the Marine Corps Combat Development Command at Marine Corps Base Quantico, Virginia. The "X" in its squadron designator originally stood for Experimental, emblematic of its original mission of testing new helicopters and flight systems. However, as its operational role in VIP transportation overshadowed its operational test and evaluation role, the "Experimental" moniker was dropped, although the squadron designator was left unchanged. Marines who fly in the Executive Flight Detachment may be eligible for the Presidential Service Badge after a certain term of service. See also 89th Airlift Wing United States Secret Service United States Marine Corps Aviation List of active United States Marine Corps aircraft squadrons List of decommissioned United States Marine Corps aircraft squadrons References Notes Bibliography Mersky, Peter B. U.S. Marine Corps Aviation: 1912 to the Present. Annapolis, Maryland: Nautical and Aviation Publishing Company of America, 1983. . External links HMX-1 Official Website The White House HMX-1 page Transportation of the president of the United States White House Military Office