The investigation began in 2007 when more than 33,000 images of minors being abused flooded into the country.
Investigators identified more than 5,200 citizens across the country who had paid for a subscription to illicit websites in order to access the content.
In 2010 it was revealed that 264 of these worked for the Pentagon as either employees or contractors. Some of them worked for the NSA and had top security clearance.
But the Daily Mail Online can reveal for the first time that NASA employees were also identified in the sickening scheme in the same year.
