JP 3-28, page 139

Example Phasing of Defense Support of Civil Authorities J-3 sufficient to continue without DOD response tasks and ends upon determination by civil authorities that recovery tasks have been completed. DOD does not generally support recovery tasks; however, in certain instances, it is possible DOD could be tasked to support specific aspects of the recovery. Transition begins when all operational aspects of mission assignments are complete and redeployment of remaining DOD forces commences. Phase 3 ends when all federal response forces have been relieved and redeployed, C2 is transferred to their respective commands, and DOD forces have transitioned all operations back to civil authorities.