Task: Translation
Input (Chinese): 2009年7月7日，弗朗西斯·奥凯洛少将取代少将纳丹·穆吉沙担任非索特派团指挥官。
Output (English): On July 7 , 2009 , General Major Nathan Mugisha was replaced as Commander of AMISOM by the general major Francis Okello .