But the young men and women have shown no signs of bending.
When commanders turn their backs, the shouts ring out: "Punk will never die!" Fists are thrown in the air and peace signs flashed. A few have managed briefly to escape, heads held high as they are dragged back.
Sixty-five young punk rockers arrived at this police detention center last week after baton-weiling police crashed a concert in Aceh -- the only province in this predominantly Muslim nation of 240 million to have imposed Islamic laws.
They will be released Friday, after having completed 10 days of "rehabilitation," from classes on good behavior and religion to military-style drills aimed at instilling discipline.
Nineteen-year-old Yudi, who goes by only one name, says it's not working.
He tried unsuccessfully to shake off police when they took an electric razer to his spiky mohawk. At the sight of his hair scattered in the grass, he recalls, tears rolled down his face.
"It was torture to me."
"I can't wait to get out of here," he added. "They can't change me. I love punk. I don't feel guilty about my lifestyle. Why should I? There's nothing wrong with it."
His girlfriend, 20-year-old Intan Natalia, agrees.
Her bleach-blond hair has been cut to a bob and dyed black and she's been forced to wear a Muslim headscarf.
"They can say what they want, but I like life as a punk," she says. "It suits me."
Two young men hated it so much at the detention center, they tried to escape.
They almost succeeded, pretending they had to go to the bathroom, then fleeing to the provincial capital, Banda Aceh, 30 miles away.
Police found them strolling the streets nine hours later and brought them back.
It was just after midnight.
"They said they missed their parents, but it's pretty clear they were lying," said local police chief Col. Armensyah Thay. "They didn't go home. How could they? They've been living on the streets."
The crackdown marked the latest effort by authorities to promote strict moral values in Aceh, which, unlike other provinces in the sprawling archipelagic nation, enjoys semiautonomy from the central government.
That was part of a peace deal negotiated after the 2004 tsunami off Aceh convinced separatist rebels and the army to lay down their arms, with both sides saying they didn't want to add to people's suffering.
More than 230,000 people were killed in the towering wave, three quarters of them in Aceh.
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