The U.S. Air Force Field Service Evaluation (FSE) program for the F-16 at MacDill AFB. More than 2,200 F110 engines have entered service since the original F110-GE-100 was introduced in 1986, and the F110 engine family now powers 75 percent of the F-16C/Ds throughout the world, including those of the United States, Greece and Turkey, as well as the Mitsubishi F-2 support fighter of Japan. Since the F110-GE-129 was introduced in 1992, 420 F110-GE-129 engines have accumulated 275,000+ engine flight hours.