Airmen from the 18th Component Maintenance Squadron conduct tests on an F-15 Eagle jet engine at the hush house Jan. 5, 2016, at Kadena Air Base, Japan. The hush house alleviates noise from the F-15 Eagle’s jet engine, which is capable of outputting 29,000 pounds of thrust. (U.S. Air Force photo by Senior Airman Omari Bernard)

A vibration monitor reads the amount of reverberations in the bay of the 18th Component Maintenance Squadron’s hush house Jan. 5, 2016, at Kadena Air Base, Japan. Vibrations in the bay are caused by the thrust generated from the test of an F-15 Eagle jet engine. (U.S. Air Force photo by Senior Airman Omari Bernard)

U.S. Air Force Staff Sgt. Donovan Walters, 18th Component Maintenance Squadron craftsman, conducts tests on an F-15 Eagle jet engine from the control room at the hush house Jan. 5, 2016, at Kadena Air Base, Japan. The 18th CMS’s hush house is capable of conducting four engine tests simultaneously with little external noise. (U.S. Air Force photo by Senior Airman Omari Bernard)

The 18th Component Maintenance Squadron tests F-15 Eagle jet engines at the hush house Jan. 5, 2016, at Kadena Air Base, Japan. The 18th CMS’s hush house was built by the government of Japan for Kadena Air Base to test F-15 Eagle jet engines without any noise pollution. The facility is the only one of its kind in the U.S. Air Force. (U.S. Air Force photo by Senior Airman Omari Bernard)

U.S. Air Force Master Sgt. Richard Camacho, 18th Component Maintenance Squadron NCO in charge of test cell, walks through the tunnel used to absorb noise during F-15 Eagle jet engine tests Jan. 5, 2016, inside a bay of the hush house at Kadena Air Base, Japan. The 18th CMS’s hush house provides one of a kind noise abatement that allows the test cell to conduct jet engine tests 24-hours a day without creating external noise. (U.S. Air Force photo by Senior Airman Omari Bernard)

U.S. Air Force Senior Airman Gerald Gangaway, 18th Component Maintenance Squadron journeyman, prepares an F-15 Eagle jet engine to be removed from the test bay Jan. 5, 2016, at the hush house on Kadena Air Base, Japan. F-15 Eagle jet engines are tested after major maintenance before being put back into the aircraft. (U.S. Air Force photo by Senior Airman Omari Bernard)