In a troubling development for the countless people saddled with student debt, the U.S. Department of Education (DOE) may be reneging on a promise made to over 550,000 such borrowers who were led to believe that their loans would be forgiven after ten years of work in the public service.

Responding to an ongoing lawsuit from four borrowers, the DOE has given no explanation but says that approval letters sent to individuals who signed up for the Public Service Loan Forgiveness Program are not in fact “binding,” the New York Times reported Thursday.

Times reporter Stacy Cowley wrote:

The program, established in 2007, covers individuals who work for 10 years at an approved place of employment, such as a nonprofit or government organization. After an individual makes 120 monthly loan payments, the program ostensibly “forgives the remaining balance.” As much as a quarter of the U.S. workforce could potentially qualify for the loan forgiveness, according to the Consumer Financial Protection Bureau.

However, for the 553,000 who have gone through the process, submitting forms to check their workplace eligibility and then receiving a note of approval, that guarantee is in doubt as they may now unexpectedly owe thousands of dollars to pay off those debts.

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Journalist David Dayen compared the move to the Bonus Army scandal, when roughly 43,000 Depression-era World War I veterans and their supporters stormed Washington D.C. to demand payment on cash vouchers given to them for their service before they were forcibly driven out by Army Chief of Staff General Douglas MacArthur under order from President Herbert Hoover.

Another reader pointed out on Twitter:

That same reader added, “This should chill every millennial with debt to the bone.”

The program encourages individuals to resubmit the forms each year and with each job change, to make sure they still qualify. But, as Cowley notes, “some of those approved borrowers might get bad news because it is unclear whether the certifications are valid.”

The reporting continues:

In December, Rudert and the American Bar Association filed suit against the DOE charging that the agency acted “arbitrarily and capriciously.”

“The idea that approvals can be reversed at any time, with no explanation, is chilling for borrowers,” Cowley observed, and is incredibly worrisome for the “first wave of qualified workers will be eligible to submit applications for debt forgiveness in October.”

While the scandal falls under the purview of the Obama administration, many fear that recently-installed Education Secretary Betsy DeVos will be no friend of student borrowers. One of DeVos’ first acts earlier this month was to reverse an Obama-era guidance which limited fees debt collectors could charge on student loans.