Many people are surprised when they discover how many aircraft were shot down whilst involved in intelligence gathering activities since the end of WW2 - a fairly comprehensive list can be viewed here:
www.spyflight.co.uk/shootdown.htm
In my opinion one of the least known and most mysterious flights was the probable overflight of Kapustin Yar by an RAF Canberra, probably in the summer of 1953.
www.spyflight.co.uk/yar.htm
The Canberra was eventually intercepted near the target and was damaged by cannon fire from a MiG, but eventually managed to land safely in Iran. If the flight took place, and I for one believe that it did, I think it's high time the extraordinary bravery and skill of the individuals involved was publically recognised.
Heimdall