This unit portrait, inscribed 'Squadron 'E,' Mather Field Cal. Sept 25th '18,' documents one of the training squadrons stationed at the Army Air Service's Mather Field near Sacramento during the final months of World War I. Roughly one hundred enlisted men, along with kitchen staff in white attire and a squadron mascot, are arranged in a formal four-row formation, offering a rare precisely dated snapshot of the personnel who supported wartime aviation training in 1918. Project: 218714