This directory sign marked the headquarters of the 4th Replacement Depot, one of the U.S. Army installations responsible for processing, housing, and reassigning American troops during the occupation of Japan following World War II. Known informally as 'repple depots,' these facilities served as way stations where soldiers awaited new unit assignments or transportation home, and detailed signs like this one guided thousands of servicemen through the depot's various administrative and support functions. Project: 218164