Military Times: Why Obama's campaign in Iraq could require 15,000 troops

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President Obama says it all the time – no combat troops will return to Iraq.

But many experts believe it will be extremely hard to achieve Obama’s newly expanded military mission there without more Americans on the ground.

“I think the slippery slope analogy is the right one for Iraq right now,” said Barry Posen, director of the Security Studies program at the Massachusetts Institute of Technology.

On Thursday, Obama authorized a new open-ended operation in response to gains by the Islamic State militants in northern Iraq.

For now, the new mission relies on aircraft based outside Iraq. The U.S. will help defend the Kurdish city of Erbil from Islamic State fighters using “targeted air strikes,” Obama said. Those air strikes began Friday morning and included at least three separate bombings before noon, defense officials said.

The second mission is a commitment to protect some 40,000 Iraqi Yazidis who are trapped on a mountain surrounded by the militants. That began Thursday night with air drops of food and water for at least 8,000 people.

Military experts say tactical commanders will want more ground forces. Forward air controllers could provide more precise targeting information. U.S. advisers could support the Kurdish forces fighting the militants. And U.S. commanders may need to expand their intelligence effort on the ground.

In turn, U.S. forces might need a forward operating base with a security perimeter, more force protection and a logistical supply line. Medevac capabilities may require a helicopter detachment and a small aviation maintenance shed.

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