Army Tactics, Techniques, and Procedures (ATTP) 3-39.20 is the manual for police intelligence operations (PIO) doctrine. This manual aligns with Field Manual (FM) 3-39, the Military Police Corps Regiment's keystone manual, and other Army and joint doctrine. Simultaneous operations that combine offensive, defensive, and stability or civil support operations are emphasized. PIO is a military police function that supports the operations process and protection activities by providing exceptional police information and intelligence to enhance situational understanding, protection of the force, and homeland security (HLS). This manual emphasizes that PIO supports, enhances, and contributes to the commander's protection program and situational understanding by analyzing, integrating, and portraying relevant criminal threat and police information and intelligence that may affect the operational environment (OE). This threat information is gathered by military police Soldiers as they conduct military police functions and by other Army Soldiers, Service policing forces, multinational elements, and security forces. This manual is written for military police and United States Criminal Investigation Command (USACIDC) Soldiers and civilians conducting the PIO function. This manual is focused on establishing the framework of PIO, how PIO supports military police and Army operations, and how to integrate PIO within the other four military police functions: law and order (L&O), internment and resettlement (I/R), maneuver and mobility support (MMS), and area security (AS). In addition to the revisions already mentioned, this manual: - Identifies the fundamentals of PIO and synchronizes PIO doctrine and task alignment to the Army Universal Task List. - Refines and clarifies key PIO-related definitions. - Highlights the critical integration of PIO throughout the other four military police functions. - Clarifies the relationship of PIO to the Army's intelligence process and the other integrating processes of Army operations. - Demonstrates the capability to collect and process relevant police information. - Acknowledges the ability of military police and USACIDC personnel to collect, process, and analyze evidence (including forensic and biometric information) during full spectrum operations. - Applies lessons learned through the conduct of recent operational experiences. - Validates the application of PIO across the spectrum of conflict.