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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
A looming concern for the Space Force is that the vehicle selected to fly 60% of NSSL Phase 2 missions — ULA’s Vulcan Centaur — is years behind schedule and has yet to perform its first launch.
Source: https://spacenews.com/the-next-battle-for-u-s-military-launch-contracts-is-about-to-begin/