I posted the OP because it is an innovative application of geothermal - an application that demands power without a supply chain and without vulnerable (to military attack) infrastructure such as solar panels or windmills - and also because, given the US military's extremely large budget, the investment could do a lot to develop the technology.

Here are the two Defense Innovation Unit annoucements, which have more detail:

https://www.diu.mil/latest/u-s-air-force-u-s-army-the-defens...

https://www.diu.mil/latest/preview/three-additional-next-gen...