Contracts were issued for development and construction in 2014, and the Space Fence was expected to be operational in the fourth quarter of 2019.[1][2] The budget is US$1.594 billion (FY15).[3]
^ abIndian anti-satellite test proves early test for Space Fence, by Debra Werner — April 11, 2019, SpaceNews.com, ...Still in testing mode, the U.S. Air Force Space Fence on Kwajalein Atoll detected India’s March 27 anti-satellite test and issued a break-up alert...The Air Force is scheduled to begin initial operation...in the fourth quarter of this year...