Lt Gen Kasaon has officially taken the oath of office to serve as the new Kenya Army Commander in a colourful swearing ceremony held at State House on 15thJuly 2011. Lt Gen J Kasaon previously served as the Commandant National Defence College .
Lieutenant General Kasaon has served in various capacities, among others as Commanding Officer 9 KR, Senior Instructor (SI) School of Infantry (SOI), Commandant SOI, Head Of Writing Team (HOWT) at Defence Staff College (DSC), Colonel Intelligence at the MIC (Military Intelligence Corps), Chief of Operations Headquarters Kenya Army (HQ KA), Chief of Operations Defence Headquarters (DHQ), Commandant School of Combat (SOC), Deputy Commandant/Chief Instructor (CI) Kenya Military Academy, then AFTC, General Officer Commanding (GOC) Eastern Command, Senior Directing Staff, (SDS) Army at National Defence College (NDC) and Commandant National Defence College (NDC) Kenya.
The appointment of the top military brass was conducted on 13th July 2011 by President Mwai Kibaki also the Commander in chief of the Kenya Defence Forces who promoted him to the rank Lieutenant General. The new Kenya Army Commander takes office from Lt Gen Njue Mwaniki.