Great video all about current U-2 operations. As a reconnaissance platform, the U-2 is still quietly doing a good amount of the US operational and strategic intel collection. But it also has game in the tactical world as well. In Korea, we would pretty routinely work with the U-2 folks in tactical scenarios and kill chain processing.
While it is not a platform that you can get assigned out of UPT, it pulls pilots from several different USAF platforms for non-permanent assignments. There are a wide swath of fighter, attack, and bomber pilots with U-2 time.
https://www.youtube.com/watch?v=OpcKKAhhGiw