Re: For those interested:
Ah yes, the A-12 or "Oxcart". There's a very good Area 51 documentary doing the rounds at the moment which is all about the Oxcart program and with firsthand accounts.
I particularly liked the bit when they were horrified to find that the Soviets had the shape of an Oxcart and were trying to figure out how. They knew when the Soviet satellites went over and religiously hauled the things indoors while they passed. They eventually figured out that, while the aircraft was hidden, the heat shadow where it had been stood on the apron remained and that's what the Russkis had picked up in infra-red.
Turning a cockup to their advantage, they made the world's largest "tangram" set out of black painted bits of cardboard. When the Soviet sats were due, they'd nip outdoors and arrange the things on the floor to make weird aircraft shapes, often adding a couple of space heaters to look like engine signatures. This worked a treat, as feedback from the spooks showed that the Russians were investing a considerable amount of time and effort in evaluating all these secret aircraft and trying to find out what they did.
One bit did have me laughing out loud. At the same time as all this was going on, the USAF were running "Project Blue Book" and more than a few of the "UFO sightings" were, of course, actually the CIA's Oxcarts. Every time the military lads followed the trail of one of these, they'd eventually hit a wall of secrecy. This would be followed by a call from the CIA telling them it was one of theirs, classified above everyone's pay grade and that they were to invent an excuse to pass it off.
Rather helpfully, it turned out that the USAF were a bit crap at excuses and tended to trot out the usual "weather balloon" type platitudes. This led to the belief that there was a monumental cover up of UFO work at Area 51, which handily distracted everyone from what was really going on and suited the CIA down to the ground. It was so useful as misdirection that the CIA made a point of pouring fuel on the fires of the conspiracy nuts at every opportunity.