Defense Secretary James Mattis called Russia's missile moves "destabilizing" as Moscow positions for war games with Belarus.
Syrian and Iranian concerns regarding the U.S. and Jordan's nearby military drills were heightened when U.S. troops were seen with rebels in Syria.
American forces have traditionally taken a background role in Somalia, but Kyle Milliken’s death may indicate greater involvement.
The U.S. and Russia will once again work together to avoid mid-air collisions in Syria after a falling out between the nations last month.
The Special Operations Command chief said his elite troops "can't do everything" and need a break from 15 and a half straight years of global warfare.
A top Army general of U.S. and NATO's European forces said the Western military alliance is taking a wartime posture to Russia's rise to the world stage.
The head of the U.S. command in Europe asked lawmakers to consider deploying more troops and equipment to ward off Russian aggression.
Top Russian political and military officials said the U.S.'s missile defense shield in Europe may encourage Washington to launch a nuclear attack on Moscow.
North Korea has accused the U.S. of plotting to enact "Plan Jupiter," an alleged biochemical weapons attack meant to topple Kim Jong Un.
The U.S. military's biggest conventional bomb may have struck the Islamic State group in Afghanistan, but it missed the target on stopping the Taliban takeover.
China pleaded for peace as heightened tensions in the Asia-Pacific made a military showdown between nuclear-armed North Korea and the U.S. appear more likely.
Poland and the Baltic states of Estonia, Latvia and Lithuania were designated as venues for four major NATO battle groups.
The U.S. military killed 18 fighters of the allied Syrian Democratic Forces in a friendly fire incident in northern Syria.
The Kinetic Energy Projectile launches a tungsten-based missile at Mach 3 that delivers a "devastating" load of hot metal fragments.
The U.S. Navy is moving forward on plans to develop a new powerful class of guided-missile frigates.
A Russian warship, armed with some of Moscow's most powerful missiles, was deployed to the eastern Mediterranean where two U.S. destroyers had launched strikes against Syria.
Russia bolstered its support for Syrian President Bashar al-Assad in the face of U.S. military action.
U.S. Strategic Command head Gen. John Hyten said the U.S. had "no defense" for Russia's SSC-8 nuclear-capable cruise missiles in Europe.
"What are Americans doing in the Persian Gulf? They had better get out of this region and not cause nuisance for the regional countries," Iran's Defense Minister Hossein Dehghan asked.
U.S. military advisers have begun dressing like their Iraqi counterterrorism allies in order to blend in and better coordinate with local forces fighting the Islamic State group in Mosul.
China has been bombing mock U.S. military bases and vessels and could strike personnel stationed in Japan without sufficient warning.