; and (3) in paragraph (5)(C), by inserting or counterintelligence activities after investigations . 1645. Briefing on memorandum of understanding relating to joint operational planning and control of cyber attacks of national scale (a) Briefing required Not later than March 1, 2020, the Secretary of Defense shall provide the appropriate committees of Congress a briefing on the Joint Department of Defense and Department of Homeland Security Memorandum of Understanding signed by the Secretary of Defense on October 6, 2018. (b) Elements The briefing required by subsection (a) shall include the following: (1) The number of planners assigned by the Department of Defense to line of effort three and line of effort four and the areas of expertise of those planners. (2) Whether the planners described in paragraph (1) are physically co-located with their counterparts in the Department of Homeland Security and are assigned full-time or part-time to line of effort three and line of effort four. (3) Whether the planners described in paragraph (1) are developing operational plans and playbooks that will be implemented in response to actual cyber attacks of national scale or whether the planning activities are limited to planning and exercise scenarios. (4) Whether the official in charge of the planners assigned to line of effort three and line of effort four has or will have operational control of a Federal response to a cyber attack of national scale. (5) Whether the National Cyber Strategy, published in September 2018, provides for a standing joint multi-agency organization and staff to plan and direct operational responses to cyber attacks of national scale. (6) The charter and implementation plan of the Joint Department of Defense and Department of Homeland Security Cyber Protection and Defense Steering Group required by the memorandum of understanding described in subsection (a). (c) Definition of appropriate committees of Congress In this section, the term appropriate committees of Congress means— (1) the congressional