DIA's intelligence operations extend beyond the zones of combat, and approximately half of its employees serve overseas at hundreds of locations and in U.S. embassies in 140 countries. The agency specializes in the collection and analysis of human-source intelligence (HUMINT), both overt and clandestine, while also handling U.S. military-diplomatic relations abroad. DIA concurrently serves as the national manager for the highly technical measurement and signature intelligence (MASINT) and as the Defense Department manager for counterintelligence programs. The agency has no law enforcement authority, contrary to occasional portrayals in American popular culture.