On Aug. 8, U.S. Navy F/A-18F jet fighters from the carrier USS George H.W. Bush launched the first American strikes against Islamic State militants in northern Iraq. Exactly one month later, U.S. warplanes have struck Islamic State more than 100 times.

The Pentagon is cloaking the aerial campaign in increasing layers of secrecy. On Aug. 19, the Air Force stopped identifying its own planes that are involved in the bombing raids—ostensibly in order to provide plausible deniability to the Muslim countries where the Air Force planes are based.

But now thanks to an amateur video, we strongly suspect that Air Force F-15E Strike Eagles—most likely flying from Al Udeid in Qatar—are bombing Islamic State. The two-seat, twin-engine F-15Es probably belong to the 48th Fighter Wing, whose permanent base is Lakenheath in the United Kingdom.

The blurry and shaky video, uploaded to Youtube on Sept. 7, depicts what is most likely an F-15 in a dark color scheme, matching the F-15E’s profile. According to War Is Boring contributor David Cenciotti, the video was shot in Rawat in Iraq’s Al Anbar province.

Islamic State control much of Al Anbar, which is situated in Iraq’s arid west.

The Boeing-made Strike Eagle is the Air Force’s workhorse fighter-bomber, owing to its two crew, a heavy bombload and enough fuel capacity to fly hundreds of miles without aerial refueling. The flying branch possesses more than 200 of the supersonic fighters and is upgrading them with new radars and weapons.

All together, the Air Force has eight frontline F-15E squadrons—six belonging to Air Combat Command in the continental U.S. and two with the 48th Fighter Wing in the U.K., part of U.S. European Command.

In an official history from 2011, Air Combat Command revealed how busy its own Strike Eagle units are. “Of the six F-15E squadrons, three were deployed to three different forward operating locations,” the command stated. “This demand required investment to meet ‘small war’ requirements while maintaining aircraft availability for future large-force combat operations.”

The three operating locations that Air Combat Command mentioned are probably Qatar, Djibouti and Afghanistan.