Vigilant Ace

Vigilant Ace is a series of large-scale aerial exercises conducted primarily over and around Japan and the Pacific Ocean to enhance interoperability among allied air and naval aviation units. The exercises involve strategic and tactical assets from the Japan Self-Defense Force and partner militaries such as the United States Air Force, United States Navy, Royal Australian Air Force, Royal Air Force, and the Republic of Korea Air Force. Vigilant Ace has drawn attention for showcasing advanced platforms, long-range operations, and carrier and bomber integration in a region marked by complex security dynamics involving People's Republic of China and Russian Federation activities.

Background and Development

Vigilant Ace traces its conceptual origins to bilateral and multilateral training initiatives like Cope North, Red Flag, Vigilant Shield, and RIMPAC aimed at improving coalition readiness and command-and-control among allies. The evolution of regional security after incidents such as the Senkaku Islands dispute and increased patrols by the People's Liberation Army Air Force led to expanded training scope in 2015 and a high-profile iteration in 2019. The exercise design reflected interoperability priorities emphasized in documents from the Ministry of Defense (Japan), United States Indo-Pacific Command, and allied defense white papers such as the 2018 National Defense Strategy.

Design and Features

Vigilant Ace emphasizes combined-arms air operations, integrating assets from F-2, F-15J, F-35A, F-35B, F-22, B-52, B-1, EA-18G Growler, E-3 Sentry, and carrier strike groups centered on USS Ronald Reagan or allied carriers. Missions include long-range sorties, aerial refueling with tankers such as the KC-135 and KC-46 Pegasus, electronic warfare, airborne early warning, and maritime strike coordination with platforms like P-3 Orion and P-8. Command and control integrates systems used by Air Self-Defense Force Tactical Air Command, PACAF, and allied joint task forces to practice deconfliction, rules of engagement, and coalition logistics.

Operational History

Early forms of Vigilant Ace-style training occurred in the 2010s during routine Cope North and Northern Edge exchanges; the 2019 iteration was notable for its scale, long-distance bomber integration, and multinational participation involving assets transiting through Andersen Air Force Base and staging from Misawa Air Base and Iwakuni. The exercise sequence included coordination with naval maneuvers near the Philippine Sea and approaches to the East China Sea, prompting responses from the People's Liberation Army Navy and the Russian Navy, which conducted observations and nearby sorties. Post-exercise assessments were discussed at forums such as the Quadrilateral Security Dialogue meetings and within the Japan–United States Security Consultative Committee.

Aircraft and Participants

Participating states have contributed a range of aircraft and units: the Japan Air Self-Defense Force fielded F-2 fighters, F-15J interceptors, and aerial refueling tankers; the United States Air Force provided F-22 air superiority fighters, F-15E, B-52 bombers, and KC-135 tankers; the United States Navy and United States Marine Corps contributed carrier air wings with F/A-18 and F-35B aircraft; allied participants included the Royal Australian Air Force with F/A-18F, the Royal Air Force with Typhoon, the Republic of Korea Air Force with KF-16 and F-15K, and the Royal Canadian Air Force with CF-18. Maritime patrol and support aircraft such as the P-8, P-3 Orion, and tanker types operated alongside E-3 AWACS to provide situational awareness.

Controversies and Incidents

Vigilant Ace has been controversial due to its timing, scale, and inclusion of strategic bombers such as the B-52 and B-1, drawing criticism and diplomatic protests from the People's Republic of China and statements from the Ministry of Foreign Affairs of the People's Republic of China. Safety incidents and close approaches between aircraft were reported and prompted inquiries by aviation authorities at Misawa Air Base and Iwakuni; interactions with Russian Federation aircraft led to formal diplomatic exchanges between Moscow and Tokyo. The political discourse around Vigilant Ace featured debates in the National Diet and commentary in allied capitals including Washington, D.C. about deterrence posture, escalation risks, and rules for aerial encounters.

Category:Military exercises