The Associated Press

WASHINGTON -- U.S. military commanders in Afghanistan have assigned "guardian angels" -- troops who watch over their comrades even as they sleep -- and have ordered a series of other increased security measures to protect troops against possible attacks by rogue Afghans.

The added protections are part of a directive issued in recent weeks by Marine Gen. John Allen, the top U.S. commander in Afghanistan, to guard against insider threats, according to a senior military official. And they follow a spike in attacks on U.S. and coalition forces by Afghans, including the point-blank shooting deaths of two U.S. advisers in Afghan-istan's Ministry of Interior.

Some of the changes have been subtle, others not so much.

In several Afghan ministries, Americans are now allowed to carry weapons. And they have been instructed to rearrange their office desks there to face the door, so they can see who is coming in, said the official, who spoke on condition of anonymity to describe the internal directive.

While Allen did not detail the new measures in a briefing earlier this week, he acknowledged changes had been made.

"We have taken steps necessary on our side to protect ourselves with respect to, in fact, sleeping arrangements, internal defenses associated with those small bases in which we operate," Allen said, adding that now someone is "always overwatching our forces."

The security measures came after the U.S. military mistakenly burned Qurans and other religious materials in February, triggering anti-American demonstrations and riots. And on Feb. 25, two U.S. military advisers were gunned down at their desks in one of the most heavily guarded ministry building in Kabul.

As a result of the shootings, more than 300 advisers were pulled out of the Afghan ministries. So far, several dozen have returned, but many will not go back until additional security measures are put in place by the Afghans.

The military official said Allen issued the directive "to get every single troop in the war zone to read it and think" -- and to emphasize that troops should be aware of their surroundings as they go about their jobs. Instead, Allen said, these types of attacks come with fighting an insurgency and happened in Iraq and Vietnam.

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