The Pentagon is on track to produce a working version of a transportable nuclear reactor, one that would become the first of the many proposed advanced reactors in the US to produce electricity. But whether the reactor ever gets deployed in the field hinges on resolving thorny domestic and international policy issues.

The high-temperature, gas-cooled microreactor being built for Project Pele, as the program is known, will need approvals from nuclear regulators, foreign governments, and the public before versions can be installed at military bases in the US and in strategic locations in other countries.

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