US forces needed to further suppress militant groups, realize Afghan gains, Nicholson said.
A propeller problem was discovered after the fleet was grounded following the July 10 Marine Reserve KC-130T crash that killed 16 troops.
Turkish officials are threatening to seize control of the Syrian town of Manbij, where U.S. troops continue to support anti-ISIS operations.
As Kurdish fighters have departed the frontlines in the battle against the Islamic State, American airstrikes in eastern Syria have decreased sharply.
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