 The Police Commanders are responsible for the 17 "Core Components" of the NOPD, including the 8 Patrol Districts and nine other units as noted below.On August 18, 2014, at a press conference at City Hall, Superintendent Ronal W. Serpas announced his retirement from the New Orleans Police Department, effective immediately.Mayor Mitch Landrieu then announced the appointment of 7th District Commander Michael S. Harrison, a 23-year veteran as the Interim Superintendent of Police.