The research into foreign weapon technology is in one of those gray areas where not only does some of those activities border really close to industrial espionage against companies in potentially allied countries, or might contradict stated US State Department positions on international law it's usually classified and spoken off in hushed tones
It's very likely that an alien(as in foreign) technology evaluation program exists without there being anything extra-terrestrial about it as legalese can trail popular changes to terms by several decades. And that mentions of those in wider circles might fuel some rumors and misconceptions among those "who wants to believe".