The 31st received two new squadrons at that time, the 555th and 510th Fighter Squadrons, along with their Block-40 F-16s. The wing immediately become involved with events in Bosnia, part of the former communist country of Yugoslavia, in May 1994 as part of Operation Deny Flight. A year later, a massive search and rescue operation took place to extract Captain Scott O’Grady of the 555th FS from behind enemy lines. An HH-53 of the United States Marine Corps picked him up after he evaded capture for six days.