; or (2) the most current operating and support cost-estimating guide of the Office of Cost Assessment and Program Evaluation (CAPE). 1653. Ground-based interceptor capacity and Fort Greely missile field infrastructure requirements (a) Sense of the Senate It is the sense of the Senate that it is the policy of the United States to maintain and improve, with the allies of the United States, an effective, robust layered missile defense system capable of defending the citizens of the United States residing in territories and States of the United States, allies of the United States, and deployed Armed Forces of the United States. (b) Increase in capacity The Secretary of Defense shall, subject to the annual authorization of appropriations and the annual appropriation of funds for National Missile Defense, increase the number of United States ground-based interceptors, unless otherwise directed by the Ballistic Missile Defense Review, by up to 28. (c) 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; (2) deploy up to 14 additional ground-based interceptors to Missile Field 1 or an alternative missile field at Fort Greely as soon as technically feasible