The United States government has already mapped out plans for the use of military on U.S. soil in case of London like riots. It is CONPLAN 2502.
Earlier I posted a video from Oath Keepers and all the illegal orders not to be obeyed. That video and information is here.
Global Security (which I find that name bizarre - as it means a world wide security and no country has it's own sovereign force) which seems to be possibly be an arm of the U.S. government, says the Posse Comitatus act does not apply to Federal Troops under the orders of the President.
Look at Global Security's logo under their "Public Eye" link
From Global Security a portion of planned military use in the United States:
The President is authorized by the Constitution and Title 10 (10 USC 331-334) to suppress insurrections, rebellions, and domestic violence. After issuing a Cease and Desist Order, the President issues an executive order that directs the Attorney General and the SECDEF to take appropriate steps to disperse insurgents and restore law and order. The Attorney General is then responsible to coordinate the federal response to domestic civil disturbances. The restrictions of the Posse Comitatus Act no longer apply to federal troops executing the orders of the President to quell the disturbance in accordance with Rules of the Use of Force (RUF) approved by the DoD General Counsel and the Attorney General.
USNORTHCOM Concept Plan (CONPLAN) 2502 (Civil Disturbance Operations), is the plan for supporting state and local authorities during civil disturbances. This plan serves as the foundation for any CDO operation and standardizes most activities and command relationships. Tasks performed by military forces may include joint patrolling with law enforcement officers; securing key buildings, memorials, intersections and bridges; and acting as a quick reaction force. The JTF commander, a general officer, coordinates all DoD support with the Senior Civilian Representative of the Attorney General (SCRAG). DoD will usually establish a JTF headquarters near where the Attorney General's local representative is based.
Until the 2005 DoD Strategy for Homeland Defense and Civil Support, the term Military Assistance to Civil Authorities (MACA) was essentially synonymous with Civil Support and served as an overarching construct that included three subordinate mission sets: Military Support to Civil Authorities (MSCA), Military Assistance to Civil Disturbances (MACDIS) and Military Assistance to Civil Law Enforcement Agencies (MSCLEA). Defense Support of Civil Authority (DSCA) has replaced MACA. The term MACDIS has been replaced by Civil Disturbance Operations (CDO).
Civil disturbances are riots, acts of violence, insurrections, unlawful obstructions or assemblages, or other disorders prejudicial to public law and order. The term civil disturbance includes all domestic conditions requiring or likely to require the use of Federal Armed Forces pursuant to the provisions of Chapter 15 of Title 10, United States Code.
The mission at NORTHCOM is to anticipate events in the homeland and to be prepared to respond, to either prevent the attacks or defeat them if they occur and then to mitigate the consequences of those attacks should they occur. In addition, NORTHCOM has a secondary mission to provide defense support to civil authorities. It's an old mission that the Army used to lump together under the Garden Plot scenario, in that there was always a brigade that was prepared to respond to civil disturbances.
Looks like we can thank all those Wonderful CON gress people and Sen ASS tors for their 2007 Defense act which gave the President the right to put military on our streets for disturbances and thus taking away the Posse Comitatus act. So there you have it, the military can/will be on the U.S. streets at the President's will and decision.
