The officer killed in an attack in Afghanistan is being identified as Major General Harold J. Greene.

U.S. officials say Greene was killed when a man believed to be an Afghan soldier opened fire at a military academy in Kabul.  More than a dozen other troops were injured in the attack, including eight Americans.

Greene was the deputy commanding general of Combined Security Transition Command-Afghanistan in Kabul.  He is the highest ranking U.S. service member to be killed in Iraq or Afghanistan.  (Metro Networks Inc.)