From CNN, here:
CIA Director David Petraeus submitted his resignation to President Barack Obama citing personal reasons, a U.S. government source tells CNN Intelligence Correspondent Suzanne Kelly. The source said Petraeus admitted to an extramarital affair and that is why he is resigning.
WaPo blog has similar coverage (though not mentioning the extramarital affair part) here. Is General Petraeus still in the military and subject to UCMJ, Art. 134 and MCM pt. IV para. 62.b?
He wears his uniform, so I guess so . Duh moment, forgot he is retired so, yes, Art. 2(a)(4), UCMJ, h/t to Zee.