WASHINGTON - Army Surgeon General Kevin C. Kiley abruptly stepped down under pressure from military superiors, the third top Army official forced out in the fallout from revelations of shabby treatment of wounded soldiers at Walter Reed Army Medical Center.

The Army said Monday that Lt. Gen. Kiley had submitted a request to retire over the weekend. Acting Army Secretary Pete Geren had asked Kiley for his retirement, said a senior defense official, speaking on condition of anonymity because he was not authorized to talk about the events.

Kiley