We’ve learned that back in 2008 a network administrator’s worst fear was realized by the Pentagon when an infected flash drive was inserted into a U.S. military laptop at a base in the Middle East. Deputy Secretary of Defense William Lynn tells Foreign Affairs, the flash drive’s malicious computer code, which was put there by a foreign intelligence agency, uploaded itself onto a network run by U.S. Central Command. That code then spread undetected on both classified and unclassified systems. Lynn calls it the most significant breach of U.S. military computers ever, but perhaps more importantly he says it served as an important wake-up call. He says, the Pentagon’s counter-attack, named Operation Buckshot Yankee, marked a turning point in U.S. cyberdefense strategy. He warns that more than 100 foreign intelligence organizations are currently trying to hack into the digital networks that support U.S. military operations, and that every day, U.S. military and civilian networks are probed thousands of times. The Deputy Secretary says the Pentagon is now working with allied governments and private companies to prepare itself for future threats. An enormous amount of foundational work remains, he says, but initiatives are in place to better protect U.S. interests, such as the creation of the the new U.S. Cyber Command.