The Army is embarking on an ambitious effort to diversify energy sources at military bases across the world and reduce dependence on fossil fuels.

The Janus program, led by Dr. Jeff Waksman, lies at the heart of the War Department’s plan to develop and install nuclear microreactors on U.S. military bases by 2028. The program’s emphasis on nuclear sourcing responds to growing concerns that military installations solely reliant on fossil fuels for power are vulnerable to outages due to modern warfare’s sweeping energy demands.