FORT RILEY, Kan. (AP) — The new leader of Fort Riley has taken command. The Manhattan Mercury reports that Major General Joseph Martin was named commanding general of Fort Riley and the 1st Infantry Division last month after the Army fired Major General Wayne Grigsby. An investigation into the circumstances surrounding Grigsby's dismissal is ongoing. A change of command ceremony was held Tuesday morning. Martin is set to deploy to Iraq in the coming weeks along with about 500 troops. While deployed, the troops will work to support Operation Inherent Resolve by helping train Iraqi forces fight the Islamic State group.