ISIL lost at least five of its militants to air strikes on Oct. 20 and a further 12 in ground fighting, including two suicide bombers, the monitoring group said. Five Kurdish fighters were also killed.
A senior administration official said Monday's airdrop was in recognition of the "impressive" resistance put up by the Kurds and the losses they were inflicting on ISIL.
But U.S. commanders said the top priority remains Iraq, where ISIL swept through much of the Sunni Arab heartland north and west of Baghdad in June and both government and Kurdish forces are under pressure.
The jihadists attacked the Kurdish-controlled town of Qara Tapah on Oct. 20, killing at least 10 people and prompting half of its population of 9,000 to flee.
"We are afraid ISIL will encircle us and turn this town into a second Amerli," said one resident of the town. He was referring to a mainly Shiite Turkmen town further north which was besieged by ISIL for two months before government troops backed by militia broke through in late August.