United States Northern Command (USNorthCom) Conplan 2501-05: Defense Support of Civil Authorities [open pdf - 5MB]
"USNORTHCOM was established in the wake of the September 11, 2001 terrorist attacks against the United States. USNORTHCOM's dual mission is to conduct Homeland Defense (HD) and DSCA operations. When directed by the President or the SecDef, USNORTHCOM fulfills its DSCA mission by responding to Requests for Federal Assistance (RFA) in accordance with (IAW) the National Response Plan (NRP) and DOD policy and guidance...This summary provides military decision makers with a brief recapitulation of the major aspects of this plan. It is based on planning factors and estimates available at the time of preparation and is subject to modification in the context of a specific contingency. The information contained herein must be updated before use in adopting Courses of Action (COAs) in a particular situation."
USNorthCom Conplan 2501-05, DSCA