Somali President Sheikh Sharif Sheikh Ahmed has named a new military chief of staff in the midst of the fighting between government forces and Islamist insurgents pushing to topple his transitional government, Radio Garowe reported Friday, DPA reported. The radio report said the new military chief is former police officer General Yusuf Osman Dhumal. His precedecessor, General Said Dheere Mohamed, is now a security advisor to Sheikh Sharif, a government spokesman was cited as saying.