It's a stark change after the U.S. joined Israeli strikes on Iran in June and engaged in some of the most intense operations since WWII in the Red Sea.
The author of this op-ed argues the recent strikes on alleged drug boats create a precedent that gives an advantage to America's near-peer adversaries.
Soon after planes were first used in war, there were specialists on the ground coordinating strikes. Space-based weapons could one day yield new observers.
The U.S. military is sending an aircraft carrier to the waters off South America, in the latest escalation and buildup of military forces in the region.
The early warning radars on Greenland are key to defending the U.S. against nuclear attack, but they're vulnerable to hypersonic missiles, critics warn.