Secretary of Defense William Perry salutes the flag during the ceremonies honoring his arrival at Tuzla Air Base, Bosnia-Herzegovinaa, during Operation Joint Endeavor. Standing directly behind Secretary Perry is COL Robert Meade (USAF), Commander 4100th Group Provisional (USAF). Operation Joint Endeavor. Operation Joint Endeavor is a peacekeeping effort by a multinational Implementation Force (IFOR), comprised of NATO and non-NATO military forces, deployed to Bosnia in support of the Dayton Peace Accords