Patterns begin to emerge from the operational data.
The crews who flew the bombers, fighters, and support aircraft carried out the most precise air campaign in history. With those words, Defense Secretary William S. Cohen lauded the performance of US and Allied airpower in Operation Allied Force, NATO's 78-day attack on the Yugoslavian regime's brutal offensive in Kosovo. The attacks forced Belgrade to capitulate on June 9. Chronology of Key 1999 Events Jan. 16. More than 40 ethnic Albanians executed by Serbs are found in village of Racak in Kosovo.