The Department of the Air Force Office of Special Investigations (OSI) is a U.S. federal law enforcement agency that reports directly to the Secretary of the Air Force. OSI is also a U.S. Air Force field operating agency under the administrative guidance and oversight of the Inspector General of the Department of the Air Force. By federal statute, OSI provides independent criminal investigative, counterintelligence and protective service operations worldwide and outside of the traditional military chain of command. Proactively, OSI identifies, investigates, and neutralizes serious criminal, terrorist, and espionage threats to personnel and resources of the Air Force, Space Force, and the U.S. Department of Defense, thereby protecting the national security of the United States. Overview The Office of Special Investigations capabilities: Protect critical technologies and information Detect and mitigate threats Provide global specialized services Conduct major criminal investigations Engage foreign adversaries and threats offensively OSI's Cornerstone is to vigorously solve crime, protect secrets, warn of threats, exploit intelligence opportunities, and operate in cyber. OSI investigates a wide variety of serious offenses – espionage, terrorism, crimes against property, violence against people, larceny, computer hacking, acquisition fraud, drug use and distribution, financial misdeeds, military desertion, corruption of the contracting process, and any other illegal activity that undermines the mission of the Air Force, Space Force, or the DoD. As of 2007, OSI had 2,900 employees. After pilot training, OSI remains the second-most requested career choice in the Air Force for officers. History The Office of Special Investigations was founded in 1948 at the suggestion of Congress to consolidate investigative activities in the Air Force. Secretary of the Air Force W. Stuart Symington created OSI as a Field Operating Agency and patterned it after the Federal Bureau of Investigation (FBI). He appointed Special Agent Joseph Francis Carroll, a senior FBI official and assistant to FBI Director J. Edgar Hoover, as the first Commander of OSI and charged him with providing independent, unbiased and centrally directed investigations of criminal activity in the Air Force. Carroll later became the first Director of the Defense Intelligence Agency The Office of Special Investigations was officially established by Chief of Staff of the United States Air Force Carl Spaatz General Order №1 of 2 January 1948. This same Order had appointed Joseph Francis Carroll as OSI commander. The official letter of Carl Spaatz of 9 April 1948 set forth the functions and responsibilities of the Office of