U.S. Government Accountability Office:

The Missile Defense Agency (MDA) is developing systems to counter hypersonic missiles. These weapons are capable of flight at speeds 5 times the speed of sound, and can maneuver mid-flight—which makes tracking them difficult.

MDA’s Glide Phase Interceptor is a missile designed to shoot down a hypersonic weapon in the middle (or glide phase) of its flight. However, we found that MDA doesn’t have plans to get early independent assessments of the program’s cost or performance risks, which could be significant.

We recommended that MDA get independent cost and technology assessments for this interceptor.

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