The truth about that is ironically enough exactly the opposite. I can't find a link to it right now, but there was a great story in the science news about a mon

The truth about that is ironically enough exactly the opposite. I can't find a link to it right now, but there was a great story in the science news about a month ago, about how many of the images from the Apollo era were intentionally low-resolution and grainy, because the US didn't want to reveal to the Soviets just how advanced their remote sensing technology was. NASA had access to the best military-grade satellite surveillance technology, and the government didn't want to tip off our cold-war adversaries.