President Obama arrived in Afghanistan on Tuesday - exactly one year since the raid by U.S. Special Forces that killed Usama bin Laden - on an unannounced visit to sign a pact outlining the role of the U.S. in the country once the military pulls out.

FOX News Radio's Rich Johnson is traveling with the President as the Air Force One Pool Reporter, and has this report from Bagram Airfield:

Simple words, through an interpreter, from President Karzai.

(President Karzai (through interpreter)) "I thank you for that, from the bottom of my heart, sir."

After a clandestine overnight flight by President Obama, the two men and their top aides signed the Strategic Partnership Agreement, laying out U.S. involvement here for the decade beyond the end of the U.S. combat effort at the end of 2014.  President Obama warned there are difficult days ahead, but...

(President Obama) "I'm confident that Afghan forces will grow stronger, the Afghan people will take control of their future."

The deal guarantees Afghanistan's sovereignty and guarantees it won't be abandoned.  As one senior official put it, "We learned the lesson of 1989," referring to the U.S. aid drying up after the Soviet Union left here.

With the President in Afghanistan, Rich Johnson, FOX News Radio.

After signing the Strategic Partnership Agreement, President Obama described some of the details of the pact:

The President capped his six-hour visit with an  address the nation from Bagram Air Field, explaining the agreement with Afghanistan.

FOX News Radio's Rich Johnson has the details from Bagram:

It's time for Afghanistan to fully assert its sovereignty, build an equal partnership with the U.S. and look to the future.

(President Obama) "A future in which war ends, and new chapter begins."

That, says President Obama, is at the heart of the Strategic Partnership Agreement he and Afghan President Karzai signed on Tuesday in Kabul.  And the reason the U.S. can sign it is the military progress over the last three years.

(President Obama) "We've built strong Afghan security forces.  We devastated al-Qaeda's leadership, taking out over 20 of their top 30 leaders."

And, says the President, a year ago, we took out the top leader - Usama bin Laden - putting the ultimate goal of destroying al-Qaeda within reach.

With the President in Afghanistan, Rich Johnson, FOX News Radio.

CLICK HERE to read the full text of the President's speech.

Surprise trips by the President involve ultra-tight security and the utmost secrecy.  On this one, Air Force One left Joint Base Edwards at about midnight Monday night.

FOX News Radio's Rich Johnson describes their arrival into Afghanistan:

We arrived in pitch darkness at Bagram Air Base - all the lights on Air Force One out - quickly off to the side.  We were quickly hustled out the back stairs and on to big Chinook helicopters and about a 30-minute ride in total darkness.  They told us, 'Keep those Blackberries and iPhones off,' otherwise we would spoil the night vision of the gunners.

WATCH more on the President's trip HERE:

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