Obama's Surprise for Troops

President Barack Obama spent just over four hours in Afghanistan Sunday on an unannounced trip to visit with U.S. forces during the Memorial Day weekend. He thanked the troops for their service as the United States hands over responsibility to Afghan forces.

"Al Qaeda is on its heels in this part of the world, and that's because of you," Obama said.

He quickly added, "Everyone knows Afghanistan is still a very dangerous place."

The United States has been fighting in Afghanistan for more than 12 years, which is the U.S.'s longest war. "Last year marked a major milestone," the President said, as Afghan forces took increased responsibility for securing the country.

"For many of you, this will be your last tour in Afghanistan," Obama said to applause.

"And by the end of this year, the transition will be complete, and Afghans will take full responsibility for their security, and our combat mission will be over. America's war in Afghanistan will come to a responsible end."

MORE on CNN.com