“ Field manual (FM) 3-39.40 is aligned with FM 3-39, the military police keystone FM. FM 3-39.40 provides guidance for commanders and staffs on internment and resettlement (I/R) operations. This manual addresses I/R operations across the spectrum of conflict, specifically the doctrinal paradigm shift from traditional enemy prisoner of war (EPW) operations to the broader and more inclusive requirements of detainee operations.
Additionally, FM 3-39.40 discusses the critical issue of detainee rehabilitation. It describes the doctrinal foundation, principles, and processes that military police and other elements will employ when dealing with I/R populations. As part of internment, these populations include U.S. military prisoners, and multiple categories of detainees (civilian internees [CIs], retained personnel [RP], and enemy combatants), while resettlement operations are focused on multiple categories of dislocated civilians (DCs).
Military police conduct I/R operations during offensive, defensive, stability, or civil support operations. I/R operations include military police support to U.S. military prisoner and detainee operations within operational environments (OEs), ranging from major combat operations to humanitarian-assistance missions in support of a host nation (HN) or civil agency. I/R operations are a major subordinate Army tactical task under the sustainment warfighting function. (See FM 7-15.) Placement under the sustainment warfighting function does not mean that I/R operations do not have relevance in the other warfighting functions. While I/R is listed under the sustainment warfighting function, it should be noted this is not a specified or implied mission of all sustainment units or commands. Most sustainment units provide logistics, personnel services, and health service support to I/R operations.”