Some Years Ago The US Air Force tried to replace the Lockheed Martin C-130 with a super short take-off and landing (STOL) airlifter, with the Boeing YC-14 and McDonnell YC-15 as the candidates. Then, things got weird. Budgets grew, funding shrank and eventually the requirement transformed into something much larger. Thus, the Boeing C-17A Globemaster III was borne to replace the Lockheed C-141B Starlifter and the Lockheed C-130 continues into its seventh decade of active production.
What goes around always seems to come around in this business, and so it is with the YC-14 and YC-15.