On December 21, 2020, the Guided Missile Submarine USS Georgia transited the Straights of Hormuz into the Persian Gulf accompanied by the Guided Missile Cruisers USS Philippine Sea and Port Royal. It is likely that at least one, possibly two, submerged attack submarines also transited the straights.
This is a significant force increase for the Navy in the region. It comes as three aircraft carriers, the USS Nimitz, USS Theodore Roosevelt, and USS Dwight D. Eisenhower are also deployed in the Pacific and Indian oceans.
The Georgia transiting on the surface of the straits sends a clear message to Iran.
Pundits are divided about what that message might be. I think there are two messages.