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( In 1946 two B-17 bombers with no humans aboard flew from Hawaii to California , but they were entirely radio-controlled by pilots on the ground . The recent documents have only reinforced this conclusion and , therefore , many older works on this subject are still quite reliable . This year , as part of my course requirement , I am doing a research on the Life and works of Dietrich Bonhoeffer . Instead of deploying in-house reactive methods , it deploys ' digital watchtowers , ' scanning engines with artificial intelligence that look at patterns and unusual characteristics within e-mails before they come into a customer 's network , whether that 's suspect files , codes , even porn-related spam . But I believe the Arbeitsdienst was essentially the only alternative to the army , for an 18-year-old man in Germany in the 1930s , and so I would caution against reading too much into mere membership in that group . " Since terrorists struck New York and Washington last year , America has moved into a security-conscious era of biometrics , gamma ray imaging systems , radiation detectors , isotope identifiers and ' bomb-bots ' - remote-control robots that can disable explosives . The agency has spent millions of dollars and innumerable hours studying how the secret profiling system known as CAPPS II could enable them to ' deter , prevent or capture terrorists ' before they board an airplane , government documents show . Software that IBM Labs is building works more like bees in a hive , with lots of autonomous agents going out into the world collecting data .