H-69 [Omitted]
The authoritative website, www.designation-systems.net, in its section on missing US Department of Defense designations, reports that when the VH-71A designation was assigned to the Lockheed Martin US-101 (winner of the VXX (Presidential Helicopter) competition), the design numbers 69 and 70 in the H-series were skipped (H-70 has since been allocated to the Bell ARH). "As has been confirmed by the VXX Program Office, the number "69" was regarded as embarrassing, because that number is also known as a synonym for a certain sexual practice. According to USAF/XPPE, H-69 will not be assigned in the future to any helicopter."
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