Over the past few years, the for-profit college industry has experienced a reckoning of sorts as increased scrutiny and the recovering economy led to enrollment declines and in the case of some schools — full-scale collapse.

But a new analysis highlights one area that seems to be boosting revenue — the money for-profit colleges get from enrolling veterans — and that has consumer advocates and Democratic lawmakers concerned.

Between fiscal year 2011-2012 and fiscal year 2013-2014, for-profit colleges’ revenue from enrolling service members grew from $727 million to $1.15 billion, a 60% jump, according to a report released Thursday by Veterans Education Success, a Washington, D.C.-based advocacy group.

The report is the latest to highlight the incentives for-profit colleges have to recruit and enroll servicemembers and veterans. In order for for-profit colleges to be in compliance with federal rules, they have to receive at least 10% of their money from sources other than federal financial aid.

The idea is that if a for-profit college is earning more than 90% of its revenue from federal coffers, it’s product isn’t good enough to convince students to spend their own money on it. But there’s a loophole in the rule — money from other government sources, like the Department of Defense or the Department of Veterans Affairs doesn’t count towards that 90%. That means that when a veteran or servicemember enrolls and uses their GI Bill or other benefits to pay tuition it’s considered part of the 10% and not part of the 90% for the purposes of the 90/10 rule.

“In order to evade the 90/10 rule, they have to recruit veterans and servicemembers and they are known for aggressive recruiting,” said Walter Ochinko, the policy director for Veterans Education Success and the author of the report.

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Indeed, nearly 200 for-profit colleges earned more than 90% of their funding from federal sources, when you include financial aid and money from the Department of Veterans Affairs and the Department of Defense, according data published by the Department of Education last year.

Democratic lawmakers are re-introducing legislation Thursday to overhaul the 90/10 rule. They and consumer advocates have argued that counting veteran and servicemember benefits towards the 10% incentivizes for-profit colleges to use aggressive tactics to recruit veterans. They’ve accused the schools of using predatory strategies, like targeted lead generation or even paying military bases to get access to servicemembers in order to recruit military personnel.

At the same time probes and lawsuits from consumer advocates, state law enforcement officials and even the federal government have raised questions about whether for-profit colleges are providing a valuable education to their students. A 2014 report from Senate investigators indicates that up to 66% of students at the for-profit colleges that received the most money from servicemember and veterans education benefits withdrew without a degree or diploma. That means servicemembers and veterans are at risk of using their hard-earned benefits on a subpar education.

“People who pay attention to what’s going in the for-profit industry know their reputation has been tarnished,” Ochinko said. “To what extent that information is absorbed by veterans I’m unsure.”