If the newest batch of 10,000 is approved, we're up to 17,000 combat troops deployed for this. (Marines there as of Mar 27, another 3,500 in about two weeks, and then at least 1 battalion of the 82nd Airborne, plus another 10,000 requested)

I have heard other units getting pre-mobilization / warnings.

https://www.stripes.com/theaters/middle_east/2026-03-27/82nd...

(This would not nearly be enough troops for large scale ground conflict, but it might be enough to go into the island tunnels looking for drones and ballistic missiles while the US tries to hold open the straight by force for... However long that takes)

Fwiw, peak deployments to Afghanistan was ~100k troops. Iran is ~2x the land mass and population.