LOS ANGELES >> When a wildfire burned across Big Sur two years ago and threatened hundreds of homes scattered on the scenic hills, thousands of firefighters responded with overwhelming force, attacking flames from the air and ground.

In the first week, the blaze destroyed 57 homes and killed a bulldozer operator, then moved into remote wilderness in the Los Padres National Forest. Yet for nearly three more months the attack barely let up.

The Soberanes Fire burned its way into the record books, costing $262 million as the most expensive wildland firefight in U.S. history in what a new report calls an “extreme example of excessive, unaccountable, budget-busting suppression spending.”

The report by Firefighters United for Safety, Ethics, and Ecology criticizes fire managers for not adapting their approach to the changing nature of the blaze. The nonprofit group, which gets funding from the Leonard DiCaprio Foundation and other environmental organizations, advocates ending “warfare on wildfires” by ecologically managing them.

The report suggests the Forest Service response was the result of a “use it or lose it” attitude to spend its entire budget, which had been boosted by $700 million because of a destructive 2015 fire season. The agency managed to spend nearly all its 2016 money in a less-active fire season on about half the amount of land that burned the year before.

“They just kept going crazy on it,” report author Timothy Ingalsbee said. “It wasn’t demand-driven. It was supply-driven. They had all this extra money Congress had given them, and they had to justify that.”

Forest Service officials would not comment directly on the report. After asking The Associated Press to provide written questions, the agency declined to answer them and issued a short statement saying it was committed to reducing costs in similarly large fires.

“Protection of people first and then resources are our primary considerations,” the statement said. “Every fire is evaluated to determine the appropriate strategy. We continually look for opportunities to improve outcomes and accountability and to find more cost-efficient and effective methods of managing wildfires.”

In addition to burning 206 square miles (534 square kilometers), the smoky fire closed signature parks in the area and put a damper on tourism in Big Sur during the peak season of its only industry. Monterey County estimated a 40 percent loss in revenue for the summer season in the area.

An internal Forest Service review produced last year and obtained by the AP reached some of the same conclusions as Ingalsbee.

For example, the department’s review found that from Aug. 9 to Sept. 29, 2016, the number of threatened structures remained at 400 even as the fire grew by more than 90 square miles (230 square kilometers), which indicated the risk to property had abated as the flames burned into the wilderness. During that period, firefighting costs grew by $140 million.

The review found forest managers didn’t think they could deviate from the “overwhelming force concept” aimed at suppression. It also said the agency’s protocol for managing long-term wildfires “does not sufficiently evaluate and adjust to changing risk.”

One challenge fire commanders faced was an outdated forest management plan for Los Padres that called for full suppression of all wildfires, Ingalsbee said.

Mike Warren, a retired National Park Service firefighter who reviewed the report, questioned the wisdom of suppressing fires in remote wilderness where flames can help eliminate brush and other flammable vegetation that could fuel a later wildfire.

When Warren was fire management officer at Sequoia and Kings Canyon National Parks, they would let blazes burn in the wilderness if they were confident the fire would stay in the park.

The challenge in a place like the tourist-dependent Big Sur area is pressure from politicians, homeowners, businesses, loggers and ranchers to control the fire, Warren said.

“When is enough enough?” he said. “When do you back off say, ‘This is it. We’re just going to let it do its thing.’ That takes some real political will.”

The Forest Service’s internal review inspired Ingalsbee to file public records requests for other documents that led to his report.

Among his findings:

— About a fifth of the area burned was from fires set to clear brush and vegetation between outer perimeters and the active fire. One of these blazes jumped fire lines. These burnout operations created additional smoke and cost an estimated $50 million.

— A nearly $39 million air campaign, including large air tankers that cost $5,720 per hour, was largely ineffective. Retardant is effective at slowing flames only where ground crews can remove vegetation to create containment lines. But drops were done deep in steep, rugged wilderness where it was too dangerous to send crews, and even where flames never reached.

— Bulldozers, which cost $1,700 per hour, tore up wilderness, creating what Ingalsbee called “ghost roads” that will remain for years. The Forest Service spent an estimated $1 million a day for weeks repairing damage done by dozers.

The report concluded that once the blaze that broke out July 22, 2016, entered wilderness, there was little chance of stopping it before fall rains fell.

Chad Hanson, an expert on fire and director of the John Muir Project, a nonprofit environmental group, said the cost was stunning, but the approach to fire was business as usual.

“It’s sort of shocking that this massive amount of taxpayer money is being spent trying to suppress backcountry fires that are weather-driven and can’t be stopped until the weather changes, rather than focusing resources on protecting communities,” Hanson said. “On the other hand, I’m not surprised the Forest Service is doing this because it’s been their practice for years.”

One beneficiary of the firefighting effort was Tom Little Bear Nason, who lives in a homestead in the national forest his family has owned for 150 years. He was also a contractor on the fire, with a team of dozer operators.

Nason, chairman of the Esselen Tribe of Monterey County, credited the suppression effort with helping save his property. But he said costs shot up when managers went overboard on backfires and cut contingency lines too far from the fire.

He also criticized the leadership on the fire, which changed every couple of weeks, for disregarding a pre-attack fire plan drawn up by local, state and federal agencies, tribal leaders, environmentalists and homeowners that included information on protecting historic and cultural sites.

He said those plans “got chucked out the window” and led to significant losses. A homesteader cabin burned to the ground, sacred sites such as burial grounds were plowed over, and a rock where tribal members gave birth was struck by a bulldozer.

“Lots of efforts went to protect communities that went above and beyond” what was necessary, Nason said. “They were acting on the worst-case scenario.”