Q. Recently, Japan collaborated with which country on a hypersonic missile-intercepting system called GPI Project?
Answer: United States
Notes: The Japan-U.S. GPI Project aims to intercept hypersonic missiles. Modified missiles from U.S. Navy ships target hypersonic weapons in their "vulnerable" glide phase. Hypersonic missiles exceed Mach 5 speeds, nearly 4,000 mph. Glide phase sees weapons separate from boosters, using gravity to accelerate and maneuver toward targets.

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