The Pentagon called it an "important development" in the fight against ISIS.
The Nusra Front released seven U.S.-backed rebels after they were kidnapped last month.
It's unclear whether the United States will try to get them back.
The flights will likely increase the number of coalition strikes in Syria.
Michael Ratney has "impressed" John Kerry, the secretary of State said.
The program has faced criticism for fielding too few forces and building up at such a slow pace.
The Pentagon said Muhsin al-Fadhli was killed in a strike on July 8.
Israeli commandos killed the general at his seaside villa.
Ashton Carter revealed that the Pentagon is only training 60 Syrian rebels to fight ISIS.
Pentagon officials defended the program despite low turnout.
Friday's estimate was the first time a military official has offered a casualty count.
They called the 700 refugees let into the U.S. in five years "an unacceptably low number."
The rebels had pledged to fight only ISIS with their American training.
The program is speeding up after a shaky start, the Pentagon said.
Pentagon says strikes could target groups other than ISIS if rebels are threatened.
The announcement represents an increased role for NATO.
Establishing the zones could draw the U.S. into a war with Syria.
Rep. Michael McCaul (R-Texas) wants to dramatically ramp up the fight against ISIS.
The bill from the 2016 contender would expedite weapon transfers to Jordan.
"It’s important for them to be a part of that conversation," Obama said.
The number is far lower than what Defense officials say they hoped for.
The goal is frustrating some lawmakers who say the campaign is progressing too slowly.
The move could bring U.S. forces closer to war with Syria.
The United States needs to decide how it's going to protect Syrian rebels it is training before...