A Missile Defense Agency signature project -- adding two "layers” to the homeland ballistic missile defense architecture by folding in the newest Aegis ballistic missile interceptor and a future variant of the Terminal High Altitude Area Defense interceptor -- is on the ropes after lawmakers raised serious concern about the endeavor's maturity. The Senate Appropriations Committee, in its mark of the fiscal year 2021 defense spending bill, recommends provisions that would effectively defund MDA's request to immediately press ahead with...