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).