The Pentagon said Tuesday that it is readying to pull all American troops out of Afghanistan after the Karzai government there has balked on inking a security agreement.

The Obama administration planned to end America’s combat mission in Afghanistan on Dec. 31, but Pentagon planners were ready to leave a significant military contingent there after the war ended.

But, like Iraq, Afghan leaders led by President Hamid Karzai have stalled talks on a “status of forces agreement” that would govern an extended American stay. And now, the Pentagon is getting ready to leave.

Some of the last American troops in Afghanistan will be from Fort Carson, which is sending its 4th Brigade Combat team to war there in the coming weeks.

Here’s a news release from the Pentagon:

“President Barack Obama today informed Afghan President Hamid Karzai that because the Afghan leader has demonstrated that it is unlikely that he will sign the bilateral security agreement on a U.S. military presence in Afghanistan beyond this year, he has asked the Pentagon to ensure that it has adequate plans in place to accomplish an orderly withdrawal by the end of the year should the United States not keep any troops in Afghanistan after 2014.

State, Colorado Springs officials spring to attention at news of defense cuts

In a summary of the Obama-Karzai phone call released to reporters, White House officials said Obama is leaving open the possibility of concluding a bilateral security agreement with Afghanistan later this year.

“However, the longer we go without a BSA, the more challenging it will be to plan and execute any U.S. mission,” they added. “Furthermore, the longer we go without a BSA, the more likely it will be that any post-2014 U.S. mission will be smaller in scale and ambition.”

Soon after, Defense Secretary Chuck Hagel released a statement expressing his “strong support” for the president’s decision.

“This is a prudent step, given that President Karzai has demonstrated that it is unlikely that he will sign the bilateral security agreement, which would provide DOD personnel with critical protections and authorities after 2014,” the secretary said. He also commended the efforts of Marine Corps Gen. Joseph F. Dunford Jr., commander of U.S. forces and the NATO-led International Security Assistance Force in Afghanistan, and other military leaders to provide flexibility to the president as the United States works to determine the future of the U.S. presence in Afghanistan.

“As the United States military continues to move people and equipment out of the Afghan theater, our force posture over the next several months will provide various options for political leaders in the United States and NATO,” Hagel said in his statement. “And during this time, DOD will still continue planning for U.S. participation in a NATO-led mission focused on training, advising, and assisting Afghan security forces, as well as a narrowly focused counterterrorism mission.”

The United States will consult closely with NATO allies and ISAF partners in the months ahead, he added, noting that he looks forward to discussing U.S. planning with NATO and ISAF defense ministers in Brussels this week.”