Proponents of the Precision Tracking Space System were not shy about touting its supposed benefits.
The head of the U.S. Missile Defense Agency said PTSS represented an "unprecedented capability" to protect America and its allies against a nuclear attack by the likes of North Korea and Iran.
A key congressional supporter described it as "a necessity for our country."
The planned network of nine to 12 satellites, orbiting high above the equator, would detect missile launches and track warheads in flight with great precision, the proponents said.
It would be able to tell apart real missiles from decoys — an elusive capability known as...