days after the date on which the vacancy occurs, in the same manner as the original designation was made. If a member of the Joint Committee ceases to be a Member of the House of Representatives or the Senate, as the case may be, the member is no longer a member of the Joint Committee and a vacancy shall exist. (c) Investigation and report (1) In general Not later than 90 days after the date of the enactment of this Act, the Joint Committee shall conduct an investigation and submit to Congress a report on the United States 2021 withdrawal from Afghanistan. (2) Elements The report required under paragraph (1) shall include the following elements: (A) A summary of any intelligence reports that indicated an imminent threat at the Hamid Karzai International Airport preceding the deadly attack on August 26, 2021, and the risks to United States and allied country civilians as well as Afghan partners for various United States withdrawal scenarios. (B) A summary of any intelligence reports that indicated that withdrawing military personnel and closing United States military installations in Afghanistan before evacuating civilians would negatively affect the evacuation of United States citizens, green card holders, and Afghan partners and thus put them at risk. (C) A full review of planning by the National Security Council, the Department of State, and the Department of Defense for a noncombatant evacuation from Afghanistan, including details of all scenarios used by the Department of State or the Department of Defense to plan and prepare for noncombatant evacuation operations. (D) An analysis of the relationship between the retrograde and noncombatant evacuation operation plans and operations. (E) A description of any actions that were taken by the United States Government to protect the safety of United States forces and neutralize threats in any withdrawal scenarios. (F) A full review of all withdrawal scenarios compiled by the intelligence community and the Department of Defense with timelines for the decisions