FD-SOI fabs are lacking. It's a planar transistor technology used frequently in very low power/thermal devices with small packages and with a high SEU tolerance. Lattice semiconductor use them in their FPGAs, which are the lowest power draw FPGAs on the market at the moment, with a really flat power curve all the way up to 125C. They're used everywhere in A&D and industrial, as root-of-trust devices on servers, and are the largest FPGA manufacturer by volume.

Currently it's fabbed in France (STMicro), Germany (GF), and South Korea (Samsung). No plans to onshore that in the US.