US spells out plan to seize Mosul and Raqqa from IS
US defence secretary Ash Carter has laid out broad plans to defeat Islamic State (IS) militants and retake the group's key power centres in Iraq and Syria.
He also announced that a special commando force had arrived in Iraq.
Speaking at Fort Campbell, Kentucky, to troops from the 101st Airborne Division who will soon deploy to Iraq, Mr Carter also said he would meet his counterparts, mainly from Europe, in Paris next week, and challenge them to bring more capabilities to the fight.
He will be meeting defence leaders from France, Australia, Germany, Italy, the Netherlands and the United Kingdom, and "will not hesitate to engage and challenge" them to get them to do more.
"Each of these nations has a significant stake in completing the destruction of this evil organisation and we must include all of the capabilities they can bring to the field," he said.
Some contributions the US has requested already are special operations forces, fighter jet and reconnaissance aircraft, weapons and munitions, training and other combat support.
However Mr Carter received a knock-back from Australia today, which said its commitment would remain largely unchanged, but kept under review.
Defence minister Marise Payne's office said: "Australia has considered the request from US secretary of defence Ash Carter in light of the substantial contributions we are already making to train Iraqi security forces and to the air campaign.
"The government has advised Secretary Carter that our existing contributions will continue."
Mr Carter's broader message signalled the completion of a military plan to help Iraqi and Kurdish Peshmerga forces retake Mosul in northern Iraq and to help moderate Syrian forces oust IS militants from their headquarters in Raqqa.
He described operations that would send Iraqi forces from the south and Peshmerga forces from the north to encircle and cut off Mosul. But he warned that taking it back will not be quick or easy, and he offered no timelines.
Mr Carter announced in December that the US would deploy about 200 special operations forces to Iraq to better capitalise on intelligence and put more pressure on the enemy.
"The specialised expeditionary targeting force I announced in December is now in place and is preparing to work with the Iraqis to begin going after Isil's fighters and commanders, killing or capturing them wherever we find them, along with other key targets," he said, using an acronym for IS.
His speech offered an upbeat assessment of the anti-IS campaign, saying that coalition-backed forces, supported by the air strikes, were taking back territory and going after the groups finances. This week air strikes hit an IS cash centre in Mosul.
Military leaders have said that the militants have lost 40% of the territory they once held in Iraq, and 20% of their territory in Syria. The effort has been aided by strong support from Kurdish troops in northern Iraq, as the US worked to build up Iraqi army forces.
The Iraqi forces struggled for months to retake Ramadi, but backed by air strikes and other logistical support they were finally able to drive IS from the city last month.
Mr Carter's remarks came a day after President Barack Obama's State of the Union speech, expanding on the message that the US must build and work with local forces in Iraq and Syria to have lasting success.
He said the US must not "Americanise" the conflicts because that would allow militants to accuse the West of occupying the country.
The ongoing US effort however, has come under fire from members of Congress and critics who say it is a failed strategy that not aggressive enough and should involve a more robust military presence to both defeat IS and protect fleeing refugees, particularly along the Turkey-Syria border.