The president campaigned on a vow to bring American troops home, but his standoff with Iran has seen thousands more soldiers deployed to the Middle East.
The International Institute for Strategic Studies said Tehran has established a regional network of some 200,000 fighters.
Turkey wants to clear Kurdish armed forces away from its southern border in "Operation Peace Spring."
Women, men, and children held in nightmarish detention centers in Libya face an even greater risk to life and limb as rival factions escalate their fight for the Libyan capital of Tripoli.
Special Representative for Iran Brian Hook said Tehran was responsible for 17 percent of all U.S. service personnel deaths between 2003 and 2011.
The Turks have sent forces into Iraq without consent from the Iraqi government.
Militias are loyal to the Quds Brigade and may have designs to fight for Shi'ites beyond Iraq.
Wahida Mohamed boasts of brutality after the murders of her two husbands, brothers and father.
Human Rights Watch says tribal militias are picking up children from displacement camps.
Shiite militias in Iraq detained, tortured and abused far more Sunni civilians during the American-backed capture of the town of Falluja in June than U.S. officials have publicly acknowledged.
Experts say the only truly vital fighting force is the Iraqi Special Forces, who have been fighting ISIS for two years.
The Justice Department is considering legal changes to combat domestic anti-government extremists.
The Malheur militants seem more interested in winning over the media than firing on the Feds.
The latest call to arms appears to have failed to resonate with like-minded groups.
Jaysh al Islam, a Syrian insurgent group, welcomes Saudi Arabia's cutting ties with Iran due to Tehran backing of Shiite militias.