Covid-19 has all the recently arrived US military to Europe sitting on their hands now.
>https://www.military.com/daily-news/2020/03/12/troops-europe-face-limbo-following-canceled-exercise-travel-ban.html
>"DEFENDER-Europe 20 was set to be the biggest deployment for an exercise in 25 years, with 20,000 soldiers deploying from the U.S. and training with 17,000 allies."
With recent events, something tells me they aren't just there for an exercise.