"Turkey has an enormous role to play," said Carter, on his first trip to Incirlik as defense secretary. "We appreciate what they`re doing. We want them to do more."
That includes Turkish forces joining "in the air and the ground as appropriate," Carter told reporters traveling with him. "The single most important contribution that their geography makes necessary is the control of their own border."
Incirlik has grown more important in the U.S.-led campaign of air strikes against Islamic State, with 59 U.S., Turkish, Qatari and German aircraft now operating out of the base, up from about 15 from all coalition countries at the beginning of September, U.S. officials said.
Around 45 aircraft are from the United States and include both manned and unmanned. They conduct refueling, intelligence and strike missions, officials said.
On Monday, speaking after a meeting of the U.S. National Security Council at the Pentagon, President Barack Obama said Carter`s trip to the region aimed to secure greater military contributions from allies in the campaign against Islamic State.
Carter did not give details of the requests to allies but said different countries` contributions could include strike aircraft, intelligence flights, transport aircraft, help in controlling borders and helping U.S. efforts to train troops.
On Tuesday, Saudi Arabia announced the formation of a 34-nation Muslim military coalition to combat terrorism.
Carter said Sunni Gulf Arab countries could encourage and help Sunni Muslim communities living in areas controlled by Islamic State, a hardline Sunni group, to resist their rule.
"That`s something that obviously they can do that it`s harder for other countries to do," he said.
"Different countries can make different kinds of contributions and over this trip and in the subsequent weeks and months I`ll be asking them each to make the strongest, most robust possible contribution that they can."
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