A Defense Department cost estimate says extending the National Guard deployment in Washington, D.C. through January 2029 will cost roughly $1.4 billion. The figure covers fiscal years 2027 through 2029 and is based on questions submitted to the department by Massachusetts Democratic Sen. Elizabeth Warren. The estimate is provided to Congress as part of the request for additional information about the funding required for the continued Guard presence in the nation’s capital. According to the reporting, the deployment extension runs until January 2029, with the total cost projected at approximately $1.4 billion for the period specified. The sources do not describe changes to the mission or any specific drivers of the costs beyond the extension itself. The estimate functions as a budgetary planning figure for lawmakers as they consider the ongoing federal arrangements in Washington, D.C.