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Secretary of the Air Force Heather Wilson, Air Force Chief of Staff Gen. David L. Goldfein, Muharren Alija, Ambassador of the Republic of Kosovo Vlora Çitaku, retired Lt. Gen. Dan Leaf, former 31st Fighter Wing and 31st Expeditionary Wing commander, Aviano Air Base, Italy and Brig. Gen. Chris Short, Aircrew Crisis Task Force director, pose for a photo in front of a new display commemorating the 20th anniversary of Operation Allied Force during a ceremony at the Pentagon, Arlington, Va., May 8, 2019. Operation Allied Force was initiated in 1999 by NATO in response to Serbian President Slobodan Milosevic’s campaign of ethnic cleansing of Kosovar Albanians. (U.S. Air Force photo by Adrian Cadiz)