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.
Acting Navy Secretary Sean Stackley said more than 50 calls had been received on an NCIS tip line so far and that the scandal could involve more websites.
It is the latest controversy surrounding the raid on a branch of al Qaeda in Yemen, the first such operation authorized by President Donald Trump as commander in chief.
The civilian casualties may include the daughter of a U.S.-Yemeni militant killed in 2011.
U.S. tanks are part of a military buildup designed to deter Russian aggression in Eastern Europe.
U.S. moves military equipment to be used in training exercises in NATO states near Russia.
The firebrand leader threatened to scrap defense pacts to oust foreign troops.
The deployment comes despite Russian protests not to deploy U.S. troops near its borders.
Veterans Affairs and the Department of Defense must work together to offer better options for patients.
U.S. senators can lead the way for women in the military across the world.
Frequency of Afghan troops going missing in America is 'out of the ordinary,' defense official says.
A new survey finds little support for Hillary Clinton in the presidential race.
The U.S. military the coalition stopped the attacks against what it had believed to be ISIS after Russia informed it that Syrian military personnel may have been hit.
Coalition-backed fighters fighting ISIS in Syria were attacked despite being part of the official cessation of hostilities.
Experts say the only truly vital fighting force is the Iraqi Special Forces, who have been fighting ISIS for two years.