Gen. Allen is retiring to care for his ailing wife. (Photo by Chip Somodevilla/Getty Images) Gen. Allen is retiring because of his wife's illness. (Photo by Chip Somodevilla/Getty Images)

Marine Gen. John R. Allen, the longest-serving leader of U.S. and NATO troops in Afghanistan, asked President Obama on Tuesday morning to accept his retirement from the military because his wife is seriously ill, a move that nullifies his nomination to be the supreme allied commander in Europe, according to his aides. [...]

Allen, who relinquished command of the war nine days ago, said his decision was not influenced by a Pentagon investigation into e-mail messages he exchanged with Tampa socialite Jill Kelley, who was involved in the scandal that prompted David H. Petraeus to resign as CIA director last year.

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