Secretary Collins asked the U.S. Court of Appeals for Veterans Claims to stop its work during the government shutdown. Judges called the request "extreme."
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.