US General David Petraeus, nominated to take command of the Afghan war, promised Tuesday to review rules limiting the use of force by coalition troops, saying he was aware of soldiers' complaints over the restrictions.

Petraeus told senators he is "keenly aware of concerns by some of our troopers on the ground about the application of our rules of engagement and the tactical directive."

"They should know that I will look very hard at this issue."

The new rules, imposed by the former commander General Stanley McChrystal, limit air strikes and artillery and mortar fire to prevent civilian casualties, a goal that Petraeus said he fully endorsed.

"I will continue the emphasis on reducing the loss of innocent civilian life to an absolute minimum in the course of military operations," he told senators at a hearing on his nomination as commander.

But he said it was crucial to ensure the rules were carried out without undue bureaucracy and that coalition and Afghan troops could defend themselves.

"When our troopers and our Afghan partners are in a tough spot, it is a moral imperative that we use everything we have to make sure that they get out of it," the general said.

He said he had conveyed his view to Afghan President Hamid Karzai and the defense and interior ministers in Kabul since he was nominated to the commander's post last week.

"They are in full agreement with me on it," he said.

Defense Secretary Robert Gates and the chairman of the US Joint Chiefs of Staff, Admiral Mike Mullen, said last week Petraeus would have flexibility as commander to review tactics in the Afghan mission.

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