Luka had succeeded the previous Liberian Chief of Staff, Kpenkpa Y. Konah, in 2006. In mid-July 2008, five reinstated AFL officers returned from the Nigerian Armed Forces Command and Staff College after training there. These officers include Lt Cols. Sekou S. Sheriff, Boakai B. Kamara, Aaron T. Johnson, Daniel K. Moore and Major Andrew J. Wleh. Subsequently, Aaron T. Johnson was promoted to colonel and confirmed by the Liberian Senate as Deputy Chief of Staff of the AFL, immediately subordinate to General Abdurrahman. A number of the current senior AFL officers have been drawn from the ranks of the previous 1993–94 Interim Government of National Unity paramilitary police force, the 'Black Berets.'