A bit OT, but there is a great story behind how Lockheed obtained the titanium supplies for building the SR-71's. Don't know if the story is entirely true, but because there was an economic embargo put in place by the US government on import/export of strategic materials/goods with the Soviet Union during the 50's and 60's, Lockheed could not obtain the supply of titanium metals it needed to build the SR-71. In order to circumvent the economic embargo, Lockheed purchased the material from the Soviets in the form of titanium shovels.
At the F-106 site, frequented by persons who flew and worked on military aircraft, a person with first hand knowledge of how they got the Ti from Russia relates it.
It was double dealing but I do not remember the specifics, you will have to dig through the site to find it.
Edited by Bob Riebe, 07 October 2013 - 18:01.