The comment (you can see the comment here) was concerning a US military document and training manual called FM 3-39.40 (alternate link) also known as Internment and Resettlement Operation.
The document is believed by many conspiracy theorists to be "proof" that the United States government is going to place citizens in interment camps and that the military was being trained to operate these places.
The person whom left comment also left a Youtube video concerning this as well:
While watching the video (which is 3:37 minutes, but tries to explain a 325 page document in that time frame) I could tell that the person who made it was obviously quote mining the document and taking a lot of things out of context, with many things that were just not mentioned.
One thing that was not mentioned was the Introduction section:
I/R operations facilitate the ability to conduct rapid and decisive combat operations; deter, mitigate, and defeat threats to populations that may result in conflict; reverse conditions of human suffering; and build the capacity of a foreign government to effectively care for and govern its population. This includes capabilities to conduct shaping operations across the spectrum of military operations to mitigate and defeat the underlying conditions for conflict and counter the core motivations that result in support to criminal, terrorist, insurgent, and other destabilizing groups. I/R operations also include the daily incarceration of U.S. military prisoners at facilities throughout the world.
This manual continues the evolution of the I/R function to support the changing nature of OEs. In light of persistent armed conflict and social turmoil throughout the world, the effects on populations remain a compelling issue. The world population will increase from 6 billion to 9 billion in the next two decades, with 95 percent of the growth occurring in the developing world. By 2030, 60 percent of the world’s population will live in urban areas. Coexisting demographically and ethnically, diverse societies will aggressively compete for limited resources.
Typically, overpopulated third world societies suffer from a lack of legitimate and effective enforcement mechanisms, which is generally accepted as one of the cornerstones of a stable society. Stability within a population may eliminate the need for direct military intervention. The goal of military police conducting detainee operations is to provide stability within the population, its institutions, and its infrastructure. In this rapidly changing and dynamic strategic environment, U.S. forces will compete with local populations for the same space, routes, and resources. The modular force’s ability to positively influence and shape the opinions, attitudes, and behaviors of select populations is critical to tactical, operational, and strategic success.
An adaptive enemy will manipulate populations that are hostile to U.S. intent by instigating mass civil disobedience, directing criminal activity, masking their operations in urban and other complex terrain, maintaining an indistinguishable presence through cultural anonymity, and actively seeking the traditional sanctuary of protected areas as defined by the rules of land warfare. Such actions will facilitate the dispersal of threat forces, negate technological overmatches, and degrade targeting opportunities. Commanders will use technology and conduct police intelligence operations to influence and control populations, evacuate detainees and, conclusively, transition rehabilitative and reconciliation operations to other functional agencies. The combat identification of friend, foe, or neutral is used to differentiate combatants from noncombatants and friendly forces from threat forces.
FM 3-39.40 is written with the acknowledgement that today’s OEs are much more variable than the environments addressed in previous doctrine. Military police must be prepared to deploy into any OE and conduct I/R operations in support of the commander while dealing with a wide range of threats and other influences. This manual builds on the collective knowledge and wisdom gained through recent operations, numerous lessons learned, doctrine revisions, and the deliberate process of informed reasoning throughout the Army. It is rooted in time-tested principles and fundamentals, while accommodating new technologies and organizational changes.
This iteration of FM 3-39.40 has been driven by a lack of existing doctrine for the rehabilitation and reconciliation of detainees and changes in OEs, the Army structure, and Army and joint doctrine. Changes not already mentioned above that have directly affected this manual include the—
• Integration of I/R operations within the overarching counterinsurgency or irregular warfare efforts of current operations.
• Development of terms of reference for detainee typology and standardization of procedures for detainee assessment.
Note. Recent decisions by the Executive Branch have adjusted the typology in JP 3-63.
• Implementation of standardized programs and methods for rehabilitation, reconciliation, and repatriation of detainees.
• Planning, employment, and sustainment of military police capabilities in support of all echelons while conducting I/R operations.
• Alignment of I/R operations with the sustainment warfighting function.
• Technological and doctrinal updates to material in other publications.
The foundations of military police operations provided in this manual, together with related military police doctrine, will support the actions and decisions of commanders at all levels. Like FM 3-39, this manual is not meant to be a substitute for thought and initiative among military police leaders and Soldiers. No matter how robust the doctrine or advanced the military police capabilities and systems, it is the military police Soldier who must understand the OE, recognize shortfalls, and adapt to the situation on the ground. It is the adaptable and professional military police Soldiers of the Military Police Corps Regiment who are most important to the future and must successfully perform their basic skills to accomplish the mission, with or without technology assistance.
Now if you read the Introduction you can tell that this doesn't have anything at all to do with the United States and it's citizens. It concerns what the military is suppose to do with displaced civilians in disaster areas and war zones that the United States is involved in in third world countries.
While there are certain things in that document that I don't agree with, it only concerns the United States military operations overseas, and not domestically, and it most certainly does not prove that FEMA camps are real.