Fire managers overwhelmed by huge wildfires blazing across the west are looking for help wherever they can find it and have called in 200 active-duty military troops to fight the flames.

It’s the first time since 2006 that the National Interagency Fire Center in Boise has mobilized soldiers for fire-suppression.

National guard troops set controlled burns outside Chelan to use up fuel as helicopters dropped water. More than 1,000 people worked to protect homes from the lightning-sparked blazes that began there last week, have burned more than 170 square miles and have destroyed an estimated 75 buildings.

“Nationally, the system is pretty tapped,” said Rob Allen, the deputy incident commander for the fires around the Cascade Mountain resort town of Chelan. “Everything is being used right now, so competition for resources is fierce.”

The active-duty troops are all coming from the 17th field artillery brigade at Joint Base Lewis-McChord near Tacoma and will be sent to a fire north of Republic, a town in central Washington, about 30 miles south of the Canadian border.

Fire managers at the center are able to enlist military help when there are not enough civilian firefighting teams, thanks to a 1975 agreement between the Defense, Interior and Agriculture departments.

The help can be crucial in particularly active years like this one. In the last two weeks alone, more than 1,500 square miles have burned in the Lower 48 states, center spokesman Ken Frederick said.

“It’s like the fire season gas pedal has been pushed to the floor in a really short period of time, and that’s stressed our resources,” Frederick said. “And that’s got us relying on help from resources we don’t normally use.”

The fires in the Pacific north-west get top priority when it comes to allocating pinched resources.

A lightning-sparked fire in Oregon’s Malheur national forest has grown to 67 square miles and destroyed 36 houses. An additional 500 structures are threatened by the flames near the community of John Day.

In the northern Rockies, so many wildfires have ignited this month that officials are letting some that might be suppressed under normal circumstances burn because manpower and equipment are committed elsewhere.

The area experienced a normal fire season until last week, when a combination of drought, high temperatures and lightning-packed storms created new blazes across western Montana and Idaho.

As of Tuesday, at least 95 fires were burning in the two states, about 30 of them considered large, according to the Northern Rockies Coordination Center in Missoula.

That included a group of fires in northern Idaho that have scorched 90 square miles and destroyed 42 homes in the last several days, as well as a wildfire in the western part of the state that led about 120 residents to evacuate near McCall.

California is doing well in terms of resources, despite a pair of huge blazes in the north. Officials prepared for a drought-fuelled fire season by bringing in several hundred more firefighters than in previous years.

In Chelan, about 180 miles east of Seattle, flames burned through grass, brush and timber. Air tankers established containment lines to keep the flames from reaching downtown, and utility workers replaced burned power poles and inspected wires.

Nearly 1,000 people remained under mandatory evacuations.

On Tuesday, smoke was thick in the air of downtown Chelan. Particles of ash fell from the sky. Some residents wore surgical masks as they walked through town.

The firefighters sleep in the woods, get up every morning and work a full day, said Allen, the deputy incident commander.

“It’s hot. It’s dirty,” said Allen, who usually works for the Bureau of Land Management in Alaska. He said authorities were looking for all the resources they could muster.

Canada has loaned resources, and authorities were also talking to New Zealand and Australia.

Everyone is working to save Chelan, at the south end of Lake Chelan in the Cascade Range.

“Chelan is still at risk, but we have very significant amounts of structure protection,” said fire spokesman Brian Lawatch. “The name of the game today would be going on offense.”

The Chelan fires are about 30% contained, Lawatch said.