The 78th Signal Battalion is a strategic Signal Battalion subordinate to the 516th Signal Brigade and headquartered at Camp Zama, Japan. The battalion supports the United States Army Japan (USARJ). The battalion has four subordinate units - Headquarters and Headquarters Detachment (HHD) (Camp Zama), 287th Signal Company (Camp Zama), 333rd Signal Company (Okinawa), and 349th Signal Company (Okinawa).