"The Afghan security forces are suffering more casualties, no question about it," Lieutenant General Mark Milley said yesterday by video link from Afghanistan.
Milley, the deputy commander of US forces in Afghanistan, said "somewhere in the range of 50 to 100 or so Afghan security forces are killed in action per week."
"And that's not at all insignificant. That is significant. And we're paying attention to that," he said.
NATO's US-led force is working to help Afghan army and police improve their tactics, conduct medical evacuations and counter roadside bombs to "minimize" casualties, Milley said.
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As Afghan forces employ more helicopters, artillery and mortars, their casualties are expected to decline, he said.
But Afghan forces were resilient and could withstand the casualties because he said they were determined to prevent Taliban militants from taking back political power, he added.
"They're hard. They're tough. And I don't think the rates of casualties, although significant, I don't think that's going to shatter or break the security force," said Milley, the head of the NATO-led force's joint command.
"I'm not assuming that those casualties are sustainable," Dunford told the British daily.
The casualty rate for Afghan forces surpasses that for US forces during the most deadly year for the NATO-led force in 2010, when about 500 American troops lost their lives in the war.
So far this year, about 100 US troops have been killed in action.
Afghanistan's 350,000-strong security forces are suffering a steep rise in attacks as the NATO mission winds down.