Air Force Office of Special Investigations

The Air Force Office of Special Investigations (OSI) is the primary investigative service for the U.S. Air Force. It conducts criminal investigations, counterintelligence, and protective service operations to protect personnel, resources, and national security. OSI personnel gather evidence, detect threats such as espionage or fraud, and ensure compliance with laws and regulations. They operate with specialized training and often handle sensitive or classified information. Essentially, OSI functions as the military’s internal law enforcement and intelligence agency, working to maintain integrity and security within the Air Force community.