The acting chief of the Federal Emergency Management Agency has left his post just six months in, officials say, marking another disruption in a year of staff departures and policy changes. The Department of Homeland Security did not comment Monday on the reason for David Richardson's departure. Richardson, a former Marine Corps officer, had no prior emergency management experience when he took on the role. His leadership was questioned after he delayed responding to deadly floods in Texas. FEMA has faced major upheaval since President Donald Trump returned to office, with significant staff turnover and funding cuts.