Four seniors at the United States Air Force Academy in Colorado may not be able to graduate because they are not vaccinated against COVID

They face being fired from the military and getting a letter of reprimand

They could also be on the hook to repay the government about $200,000

The seniors - who have not been named - all applied for religious exemptions but their requests were denied 

More than a dozen other cadets at the university also applied for the exemption and now face 'administrative separation'

Military leaders claim their refusal to get the vaccine means they're disobeying direct orders

The military first implemented a vaccine mandate last year