The Marine Corps was paying $60,000 more than it was supposed to for a type of radio cable since 2007, according to Stars and Stripes.

The cable was discovered to be overpriced in October 2016, when Marine Cpl. Riki Clement had to fix a radio. After being told that the needed parts would take six to eight months to arrive, he decided to reverse engineer a replacement using old parts and found out its true cost was actually closer to $4,000.

Later that month, the Marine Corps said the corporal had saved the government $15 million.

The defense contractor that makes the cable, Astronics, had been charging $64,000 for each cable. Astronics did not immediately respond to request for comment.