In a February 25 memo to the Defense Department, the Department of Homeland Security identifies four sectors along the southern border that require reinforcement through barriers, light installation and other measures. Combined, the mileage amounts to approximately 218 miles of new or replacement barrier... The four sectors listed are: El Centro, Yuma, Tucson and El Paso... In the El Centro sector, the Department of Homeland Security requests the replacement of around 15 miles of existing vehicle barrier with new pedestrian fencing, in addition to light installation. The project is located in Imperial County, California. In the Yuma sector, the Department...