; 10 U.S.C. 2431 note) is amended— (1) by striking (a) In general .— and inserting the following: (a) Development, testing, and deployment (1) Development ; and (2) by adding at the end the following new paragraphs: (2) Testing and deployment The Director shall begin on-orbit testing of a hypersonic and ballistic tracking space sensor no later than December 31, 2021, with full operational deployment as soon as technically feasible thereafter. (3) Waiver The Secretary of Defense may waive the deadline for testing specified in paragraph (2) if the Secretary submits to the congressional defense committees a report containing— (A) the explanation why the Secretary cannot meet such deadline; (B) the technical risks and estimated cost of accelerating the program to attempt to meet such deadline; (C) an assessment of threat systems that could not be detected or tracked persistently due to waiving such deadline