Comment: Technically, they're not U-2s anymore... (Score 5, Interesting) 266
They were re-classifed as TR-1(x) models in the mid-80s.
The U-2 is not longer a "traditional" spy-plane (i.e. photoreconnaissance of fixed points of interest). It had all the high-res photography equipment replaced with side-band IR and wide-angle low-light cameras. Bascially, they turned it from a "oooh, look at that neat weapons complex" single-frame photographer into a massive photo Hoover (or Vax, for our Brit friends).
Turns out, the U-2 is massively useful here: incredibly high service ceiling, newer semi-stealth improvements in materials, and a batshit crazy loiter time. It outlived the SR-71 because it turns out point-recon is better done by LEO satellites, and the SR-71 can't loiter. Or go slow enough to photograph a wide area well.
I'm kinda surprised that the Global Hawks are more expensive than the TR-1, though, given that the TR-1 now required non-trivial maintenance, and human costs to fly. Then again, this is 1950s technology, and the B-52 shows that if you can figure out where it works, well, high-tech doesn't always mean better mission success.
Now, if only they'd cancel those stupid Littoral Combat Ship programs (yeah, we're building 2 production versions, cause we couldn't decide which sucked less), we could look at some significant savings...
-Erik