Two F-16 pilots from the New Jersey Air National Guard's 177th Fighter Wing led a mixed formation including a Bulgarian Air Force MiG-29 Fulcrum and MiG-21 Fishbed over Bulgaria during Thracian Star on 20 July 2015. Thracian Star is a bilateral training exercise to enhance interoperability with the Bulgarian Air Force. The exercise took place at Graf Ignatievo AB in Bulgaria.