The number of C.I.A. deaths in Afghanistan rivals those killed in the Southeast Asia conflicts of nearly a half-century ago.
The Defense Department had for years publicly disclosed only the number of troops taking part in the NATO-led mission in Afghanistan, not counterterrorism forces there.
The Pentagon is investigating the deaths of two Army Rangers during a raid targeting a leader of Islamic State militants in Afghanistan.
The two were killed, and a third was wounded, in an operation in the same part of Afghanistan where the military dropped its most powerful conventional weapon.
A new version of the largest conventional bomb in the American arsenal, so big it had to be dropped from a cargo plane, was used for the first time in combat.