ROUGH CUT (NO REPORTER NARRATION)<br/> <br />Former U.S. spy agency contractor Edward Snowden, who leaked details of massive U.S. intelligence-gathering programs, said in a U.S. TV interview he "was trained as a spy" and had worked undercover overseas for U.S. government agencies.<br/> <br />In an advance excerpt of his interview in Moscow with "NBC Nightly News" that aired on Tuesday (May 27), Snowden rejected comments by critics that he was a low-level analyst.<br/> <br />"Well, it's no secret that the U.S. tends to get more and better intelligence out of computers nowadays than they do out of people," Snowden told NBC news anchor Brian Williams.<br/> <br />"I was trained as a spy in sort of the traditional sense of the word in that I lived and worked undercover overseas - pretending to work in a job that I'm not - and even being assigned a name that was not mine."<br/> <br />Describing himself as a "technical expert," Snowden said: "I don't work with people. I don't recruit agents. What I do is I put system