 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (February 2024) |
| Marine Helicopter Squadron 1 | |
|---|---|
 HMX-1 insignia | |
| Active | 1 December 1947 – present |
| Country |  United States |
| Branch |  United States Marine Corps |
| Type | Medium Helicopter Squadron |
| Role | VIP Transport Operational Testing and Evaluation |
| Part of | Headquarters Marine Corps |
| Garrison/HQ | Marine Corps Air Facility Quantico |
| Nickname(s) | "The Nighthawks", "Marine One" |
| Tail Code | n/a |
| Commanders | |
| Current commander | Colonel Bradley J. Harms |
| Notable commanders | Keith B. McCutcheon Edward C. Dyer |
Marine Helicopter Squadron One (HMX-1) is a United States Marine Corps helicopter squadron responsible for the transportation of the president and vice president of the United States, heads of state, Department of Defense officials, and other VIPs as directed by the Marine Corps and White House Military Office. A Marine helicopter with the president aboard uses the call sign "Marine One". Previously, HMX-1 was also tasked with operational test and evaluation (OT&E). This task was reassigned to VMX-1 in Yuma, Arizona; since the contract award of the new presidential helicopter in 2014 to Sikorsky Aircraft, however, HMX-1 has assumed the temporary role of OT&E for this platform, because of its unique nature and mission[clarification needed]. The VH-92A first flew in 2017 and became operational in 2024. Nicknamed "Nighthawks", HMX-1 is headquartered at Marine Corps Air Facility Quantico, Virginia, and maintains detachments at Joint Base Anacostia–Bolling in Washington, D.C., and Joint Base Andrews Naval Air Facility in Maryland.