The Boeing MH-139 Grey Wolf is a twin-engine helicopter operated by the United States Air Force (USAF) for security and support missions.

On 24 September 2018, the U.S. Air Force awarded Boeing a $2.4 billion contract to replace the aging UH-1N helicopter fleet, with the goal of enhancing security patrols of nuclear missile fields and transporting senior officials.

[1] This was the first major acquisition for the Air Force Global Strike Command in its 10-year history, following the cancellation of the previous Common Vertical Lift Support Program (CVLSP).

[8] The Grey Wolf program has faced numerous setbacks and delays, including difficulty with attaining Federal Aviation Administration type certification.

[15] On September 1, 2023, the Pentagon issued a Selected Acquisition Report outlining plans to reintroduce 14 MH-139A Grey Wolf helicopters into the Air Force's program, bringing the total to at least 56 aircraft.