Since WWII, there have been some really remarkable developmental programs, such as the SR71, the F22s, and the KC135, that have changed the whole of military aviation. So which aircraft and its developments effected aircraft, the way their are built, and the features that they accommodated. For me there are two real competitors: the SR 71 and the KC135. The KC135 comes in a close second for me, as it has lasted so long, proven so useful to the USAF over its roughly 50 years of service, not to mention the 707 (but we are in Mil-Av). The SR71, takes the cake for me, as it was such an amazing development and product that it is still classified today, even though it was largely based on technology from the 1950s.
So what program do you think was the most revolutionary (in its contributions to aircraft tech, production tech, general concepts, etc)?