They have a wide range of them---I am thinking it is this one:
https://www.eeworldonline.com/lockheed-martin-develops-high-power-micro-cryocooler-for-satellites/
These just to keep instruments cool.
https://www.eeworldonline.com/lockheed-martin-develops-high-power-micro-cryocooler-for-satellites/
These just to keep instruments cool.