One Ukrainian innovation has been a system to verify drone strikes that awards points to successful operators, with an online marketplace for bonus kit.
The one-star command, located at Fort Bragg, was created in 2018 to help sustain the Army's specialized units built to assist partner forces worldwide.
The attack comes amid a new chill in relations between Moscow and Washington after Russia condemned the US seizure of an oil tanker in the North Atlantic.
A US-backed European peacekeeping force would secure an eventual peace deal, with additional help for Ukraine to build an 800,000-strong peacetime force.
The tragedy of NATO expansion lies not in beginning it, but in never considering when and where it might end, argues former NATO official Michael Rühle.