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Lawmakers, she said, have a “blind spot” when it comes to defense spending, and never want to see the amount of money given to the Pentagon go down, even if it winds up being wasted.

“If the top line goes up, they’re in favor of it. If the top line goes down, they’re against it,” Ms. de Rugy said. “And there’s very little attention paid to the money that’s spent underneath that line.”

AM General spokesman Jeff Adams said the company provides spare parts in a “time-sensitive and efficient manner.”

“AM General negotiated pricing with Defense Logistics Agency representatives on HMMWV spare parts precisely in accordance with regulations and utilizing best practices in the government contracting industry,” he said. “The company has been recognized many times for performance excellence and is committed to dealing with its customers in a fair, honest and straight-forward manner.”

Just because troops are being withdrawn from Afghanistan doesn’t mean the demand for replacement parts is going to subside, said Dakota Wood, a retired Marine Corps lieutenant colonel who began his career as a motor transport officer working with Humvees.

“Whether the vehicles that the troops will be using remain in use or are brought back, they’re still being driven and they’re still being broken,” said Mr. Wood, now the senior research fellow for defense programs at the Heritage Foundation, a conservative think-tank.

The vehicle itself isn’t going anywhere.

“We’ve had Humvees for 30 years,” Mr. Wood said. “It is the utility truck across the military.”