Incident occurred in 2008 when an infected Flash drive was inserted into a U.S. military laptop in the Middle East. Deputy Secretary of Defense William J. Lynn says it was the most significant ever for the Department of Defense. Lynn says frequency and sophistication of attacks on military networks has increased exponentially over the past decade. Attacks on companies like Google, which disclosed in January that it had lost intellectual property to a sophisticated cyber attack from China, may present an even greater long-term threat than attacks on critical infrastructure.”]
Source: https://www.darkreading.com/attacks-breaches/pentagon-confirms-flash-drive-breached-military-network