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An F-16 Fighting Falcon with the 13th Fighter Squadron taxis to a hardened aircraft shelter prior to the start of VIGILANT ACE 18 at Osan Air Base, Republic of Korea, Nov. 30, 2017. VIGILANT ACE 18 is an annual flying exercise encompassing more than 12,000 personnel on the Korean Peninsula and will be executed Dec. 4 through 8. More than 280 Airmen and 18 F-16s from the 35th Fighter Wing are currently participating in the exercise, further developing readiness and interoperability within the Indo-Asia- Pacific region.