In early 1964 Bob Schumacher conducted a number of trial landings and take-offs from the USS Ranger and a number of other CIA pilots, including Jim Barnes, became carrier qualified. The target for the U-2G was the French nuclear test site, situated at Mururoa Atoll in the middle of the South Pacific, well out of the range of a land-based U-2. Consequently, in May 64 a U-2G operating from the USS Ranger photographed Mururoa Atoll and until 1968 three of the CIAs fleet of U-2s and a number of pilots were always carrier capable, although few actual sorties were ever flown.

Source.
http://www.spyflight.co.uk/u-2s.htm

Grimes said Soviets shot down more than 30 U.S. aircraft and 200 crewmembers during the Cold War.
(link seems to be broken)
http://www.beanerbanner.com/BB%202/RC-130%20Shoot%20Down.htm

Did you know that we occasionally flew armed reconnaissance missions and in some cases actually exchanged fire with the Soviets with the aircraft like the RB-47?
http://www.spyflight.co.uk/rb47.htm

http://www.b-29s-over-korea.com/John_S_Lappo/John_S_Lappo...

For more U-2 footage.
http://www.creativefission.com/Frame_Film_DVD_U2.html (less info)