In total, some 5,000 people work in Antarctica during its summer months, across 80 research stations operated by about 30 countries.
"Our strong preference is to continue to serve the Department and our warfighters — with our two requested safeguards in place," Amodei said. "We remain ready to continue our work to support the national security of the United States."
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Nasa said this additional flight would not slow down its return to the Moon - it is still aiming for 2028 for one or even two lunar landings in what will be Artemis IV and V.