An analysis of the strategic, operational, and tactical benefits of adding additional ground-based interceptors at each missile field. (B) A detailed description of the infrastructure needed and costs associated with expanding each missile field. (C) An identification of any environmental, technical, or logistical barriers to expanding each missile field. (D) Any analysis of alternatively using Missile Field 4 and Missile Field 5 to increase the number of ground-based interceptors. (3) Form The report submitted under paragraph (1) shall be submitted in unclassified form, but may include a classified annex. (d) Deployment Not later than December 31, 2021, the Secretary of Defense shall— (1) execute any requisite construction to ensure that Missile Field 1 or Missile Field 2 at Fort Greely or alternative missile fields at Fort Greely which may be identified pursuant to subsection (c), are capable of supporting and sustaining additional ground-based interceptors