16th Base Post Office, Presidio of San Francisco

• World War II Origins: The 16th Base Post Office (BPO) at the Presidio of San Francisco was established during World War II as a critical node in the Army Postal Service, processing vast quantities of mail for troops stationed throughout the Pacific Theater. • Mail for the Pacific: The 16th BPO was responsible for routing mail to and from soldiers fighting in the Philippines, New Guinea, Australia, and later, post-war Occupation Forces in Japan and Korea. • Volume of Operations: At its wartime peak, the 16th BPO handled millions of pieces of mail each month, making it one of the largest military post offices on the West Coast. • Morale Booster: The timely delivery of mail was considered so crucial to troop morale that the 16th BPO’s operations were deemed as vital to the war effort as food and ammunition. • Women’s Army Corps (WAC): The unit included members of the Women’s Army Corps, who played a significant role in sorting and distributing mail, breaking traditional gender roles in the military workforce. • Security Measures: Due to the sensitive nature of military communications, the 16th BPO implemented strict censorship and security protocols, including screening for coded messages. • Famous Visitors: The Presidio and its post office were occasionally visited by notable figures, including General Douglas MacArthur and entertainers on USO tours, highlighting the unit’s importance. • Post-War Role: After WWII, the 16th BPO continued to serve as a hub for military mail, supporting the Korean War and Cold War deployments, adapting to the evolving needs of the armed forces. • Closure and Legacy: With the end of the Presidio’s active military role in the 1990s, the 16th BPO was deactivated, but its historic building remains as part of the Presidio’s National Historic Landmark District. • Philatelic Interest: Covers and postmarks from the 16th BPO are now prized by military postal history collectors, offering a tangible link to the stories of wartime communication and the soldiers who served.