FM 3-39.40, titled Internment and Resettlement Operations, was published by the U.S. Army in February 2010. It outlines procedures for handling detainees in various operational contexts, including domestic scenarios under civil support operations. The manual includes references to psychological operations (PSYOP), detainee rehabilitation, and coordination with agencies like the UN, Red Cross, DHS, and FEMA.
You can read the full document here: https://info.publicintelligence.net/USArmy-InternmentResettlement.pdf Or access it via archive: https://archive.org/details/FM3-39.40InternmentAndResettlementOperations20100212
Key tension: The manual does mention efforts to “develop an appreciation of U.S. policies” among detainees, which critics interpreted as ideological conditioning. However, it’s framed within broader detainee management and rehabilitation—not explicitly as “re-education camps” for political dissidents. The language is vague enough to trigger concern but not definitive enough to confirm intent.