The Department of the Army Criminal Investigation Division (CID), previously known as the United States Army Criminal Investigation Command (USACIDC) is the primary federal law enforcement agency of the United States Department of the Army. Its primary function is to investigate felony crimes and serious violations of military law & the United States Code within the US Army. The division is an independent federal law enforcement agency with investigative autonomy; CID special agents, both military and civilian, report through the CID chain of command to the CID Director, who reports directly to the Under Secretary of the Army and the Secretary of the Army. Unlike their counterparts at OSI and NCIS, Army CID does not have primary counterintelligence responsibilities.

The Air Force Office of Special Investigations 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.