F-35As at Kunsan Air Base, South Korea

A U.S. Air Force F-16 Fighting Falcon and four F-35A Lightning IIs assigned to the 34th Expeditionary Fighter Squadron Hill Air Force Base, Utah, taxi toward the end of the runway during exercise VIGILANT ACE 18, Dec. 3, 2017, at Kunsan Air Base, Republic of Korea. The Airmen from the 34th EFS deployed to Kadena Air Base, Japan in October, and sent Airmen and aircraft to participate in the week-long, annual VIGILANT ACE exercise in support of the Mutual Defense Treaty between the U.S. and Republic of Korea. (U.S. Air Force photo by Senior Airman Colby L. Hardin)
A U.S. Air Force F-16 Fighting Falcon and four F-35A Lightning IIs assigned to the 34th Expeditionary Fighter Squadron Hill Air Force Base, Utah, taxi toward the end of the runway during exercise VIGILANT ACE 18, Dec. 3, 2017, at Kunsan Air Base, Republic of Korea. The Airmen from the 34th EFS deployed to Kadena Air Base, Japan in October, and sent Airmen and aircraft to participate in the week-long, annual VIGILANT ACE exercise in support of the Mutual Defense Treaty between the U.S. and Republic of Korea. (U.S. Air Force photo by Senior Airman Colby L. Hardin)

Four U.S. Air Force F-35A Lightning II’s from the 34th Fighter Squadron, Hill Air Force Base, Utah, taxi down the runway at Kunsan Air Base, Republic of Korea, Dec. 3, 2017, during exercise VIGILANT ACE 18. The annual exercise featured 12,000 U.S. personnel working alongside members of the Republic of Korea Air Force at eight U.S. and ROK military installations. (U.S. Air Force photo by Tech Sgt. Joshua Rosales)
Four U.S. Air Force F-35A Lightning II’s from the 34th Fighter Squadron, Hill Air Force Base, Utah, taxi down the runway at Kunsan Air Base, Republic of Korea, Dec. 3, 2017, during exercise VIGILANT ACE 18. The annual exercise featured 12,000 U.S. personnel working alongside members of the Republic of Korea Air Force at eight U.S. and ROK military installations. (U.S. Air Force photo by Tech Sgt. Joshua Rosales)
U.S. Air Force F-16 Fighting Falcons assigned to the 8th Fighter Wing taxi in front of an F-35A Lightning II assigned to Hill Air Force Base, Utah at Kunsan Air Base, Republic of Korea, Dec. 3, 2017. The 8th Fighter Wing hosted the fifth-generation fighters to train side-by-side during the week-long, bi-annual exercise VIGILANT ACE 18. (U.S. Air Force photo by Master Sgt. Frank W. Miller III)
U.S. Air Force F-16 Fighting Falcons assigned to the 8th Fighter Wing taxi in front of an F-35A Lightning II assigned to Hill Air Force Base, Utah at Kunsan Air Base, Republic of Korea, Dec. 3, 2017. The 8th Fighter Wing hosted the fifth-generation fighters to train side-by-side during the week-long, bi-annual exercise VIGILANT ACE 18. (U.S. Air Force photo by Master Sgt. Frank W. Miller III)