21.   The Pentagon has set its own goal of achieving two successful intercepts of a mock warhead before concluding that the system is technically feasible.

22.   The Pentagon, he said, has altered future tests to heighten artificially any possible differences that could be detected between mock warheads and decoys.

23.   The Pentagon suffered a serious setback in January when a missile fired from the Marshall Islands failed to hit a mock warhead fired from a California air base.

24.   The test Saturday morning was delayed by two hours after a technical problem was discovered in the target missile that was to launch the mock warhead.

25.   The upcoming June test will be the third attempt to demonstrate that a missile fired into space can hit a mock warhead propelled by another missile.

26.   They see mock warheads and decoys as twinkling points of light, like stars.

27.   To date, targets in the interception tests have consisted of a single mock warhead and a single decoy balloon.

28.   Two of the experiments were target flybys, one succeeded in hitting a mock warhead and one failed.

29.   When the hit occurred, fragments from the collision scrambled ground-based radar that had tracked the mock warhead.

30.   A missile interceptor will try to collide in space with a mock warhead over the central Pacific Ocean, officials said Tuesday.