USAF F-16s Train Over Bosnia in Warning Against ‘Secessionist Activity’ Jan. 10, 2024 | By Chris Gordon U.S. Air Force F-16s flew over Bosnia and Herzegovina on Jan. 8 in a show of force aimed at deterring “secessionist activity” by Bosnian Serbs that is at odds with U.S.-brokered peace accords, the U.S. government said.