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He had been on track to be the top NATO commander in Europe. But the White House says Allen needs to "address health issues within his family." Allen was recently cleared of wrongdoing related to email messages he exchanged with a Florida woman.

Allen's nomination was put on hold after he was entangled in the extramarital affair scandal that led to the resignation of CIA Chief David Petraeus.

A Pentagon investigation has cleared General John Allen, the top U.S. commander in Afghanistan. The Pentagon had been looking into whether the general's email correspondence with a Florida socialite was inappropriate and violated military rules. Allen's nomination to become the top commander of NATO is still on hold, however.

Allen was implicated in the scandal when an investigation found potentially inappropriate emails sent by Allen. The investigation by the Inspector General found the allegations were "unsubstantiated."

The top U.S. commander in Afghanistan has been caught up in the scandal surrounding former CIA Director David Petraeus. But the Pentagon chief cautioned today that Allen may not have done anything inappropriate.

The stunning resignation of CIA Director David Petraeus, a retired 4-star general, has been followed by an investigation into potentially inappropriate communications between Gen. John Allen and a woman in Tampa.

The investigation into the former CIA director's extramarital affair has now ensnared the top U.S. commander in Afghanistan. Investigators found thousands of communications between Gen. John Allen and a Tampa woman. He says they were not inappropriate. The sordid story is getting confusing.

Gen. Joseph Dunford will be nominated to succeed Gen. John Allen as the top commander in Afghanistan, according to a defense official familiar with the decision. Allen is to become head of the U.S. European Command.

Most Afghans realize that the presence of U.S. and coalition forces has "literally reshaped their country after decades of war and conflict," says Ambassador James Cunningham. Also: A top general says stress of fasting during Ramadan may be factor in "green on blue" attacks.

On Capitol Hill, lawmakers are hearing about the ripple effects on the mission in Afghanistan from the murders of 16 civilians, allegedly by a U.S. Army staff sergeant.