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.
Fighter jets flying off the aircraft carrier Dwight D. Eisenhower used a variety of munitions for the first time ever in combat, according to the Navy.
The top National Guard Bureau officers have left or will soon retire, and to date no nominations for their replacements have been confirmed by the Senate.
The scope of foreign policy challenges facing the next U.S. president highlights how consequential what happens in Washington is for the rest of the world.