Navy Aegis Ballistic Missile Defense (BMD) Program: Background and Issues for Congress [November 9, 2017] [open pdf - 1MB]
"The Aegis ballistic missile defense (BMD) program, which is carried out by the Missile Defense Agency (MDA) and the Navy, gives Navy Aegis cruisers and destroyers a capability for conducting BMD operations. Under the FY2018 budget submission, the number of BMD-capable Aegis ships is scheduled to be 36 at the end of FY2018 and 51 at the end of FY2022. [...] The Aegis BMD program is funded mostly through MDA's budget. The Navy's budget provides additional funding for BMD-related efforts. MDA's proposed FY2018 budget, as amended on November 6, 2017, requests a total of $2,173.5 million in procurement and research and development funding for Aegis BMD efforts, including funding for two Aegis Ashore sites in Poland and Romania that are to be part of the EPAA."
CRS Report for Congress, RL33745
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html