In late 2021, U.S. Cyber Command's Cyber National Mission Force (CNMF) deployed to Ukraine its largest hunt-forward operation (HFO) to date. Like a traditional reconnaissance element, these U.S. Marine Corps, Navy, and Coast Guard defensive cyber operators and intelligence analysts hunted and gained insight into Russian malicious cyber activity as tanks massed along Ukraine's border. 1 They worked in-country, side by side with senior Ukrainian officials, for nearly 70 days to assist in the cyber defense of multiple critical networks.

https://www.usni.org/magazines/proceedings/2023/june/defensive-cyber-warfare-lessons-inside-ukraine

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