On one of the missions I was lucky enough to fly was one when Nixon went to U.S.S.R. in 1972. Our leg of the mission was to fly from Tehran Iran to Kiev. Eventhough it's true English is a truly universal language in the world of flying it was not spoken behind the Iron curtain. For us to accomplish our mission we had a Russian pilot fly with us to work the radios. When we showed up at the airplane in Tehran for our pre flight we notice several of our instruments had duct tape covering them. We soon learned this was a prank by our flight engineer to pimp our Russian pilot. Sure enough it worked like a charm. The Russian pilot would politely ask us about our instruments and we would just as politely tell him. He would then repeatedly ask about the instruments that were covered with the duct tape and we would always tell him they were classified. It worked like a charm. To this day I laugh at the debriefing he went through and what he must have told his comrades about our classified instruments covered with duct tape.