After struggling for years to identify groups in Syria that it can confidently support, the Obama administration on Friday abandoned its effort to build a rebel force inside Syria to combat the Islamic State. It acknowledged the failure of its $500 million campaign to train thousands of fighters and said whatever money remained would be used to provide lethal aid for groups already engaged in the battle.

Senior officials at the White House and the Pentagon said the strategy to pull fighters out of Syria, teach them advanced skills and return them to face the Islamic State had failed, in part because many of the rebel groups were more focused on fighting the Syrian president, Bashar al-Assad.
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But officials said they were trying to adapt their strategy by seeking to identify the leaders of “capable, indigenous forces” in Syria who — after what the officials described as a vigorous vetting process — will be the first time the Pentagon has given military equipment to rebel leaders to distribute to their forces engaged in fighting on the ground. The C.I.A. has for some time been covertly training and arming groups fighting Mr. Assad.

“We need to be flexible. We need to be adaptive,” said Brett McGurk, a top adviser to Mr. Obama on the fight against the Islamic State, also known as ISIS or ISIL. “Is it best to take those guys out and put them through training, or to keep them on the line fighting and give them equipment and support?” (...)