But I'm pretty sure the NSA doesn't care about looking at some random guy's ass.
In the unlikely case that they do need to investigate the ass for national security reasons, they aren't going to disseminate the picture to the world, similar to how they don't disseminate intelligence data.
Which means the ONLY way the public will see the ass-picture is if: a) The ass is of interest to national security AND b) The ass is of such concern to national security it is stored in the NSA's internal ass-database AND c) There exists some kind of ass-Snowden that leaks all the asses in the NSA arsenal.
...why does anyone care about this?