In July 1989 Jacoby returned to Washington as the head of the Intelligence Assignment and Placement Branch at the Naval Military Personnel Command. He was promoted to captain in September 1989. In January 1990 he was selected for an early rotation and assignment as Assistant Chief of Staff for Intelligence on the staff of Commander, U.S. Pacific Fleet at Pearl Harbor, Hawaii. During this assignment he conceptualized and gained concurrence for the merger of three intelligence centers on Oahu that served CINCPAC, CINCPACFLT and PACAF in to single Joint Intelligence Center. This Joint Intelligence Center, Pacific (JICPAC) became the model for joint centers in the European and Central Commands. Additionally, he was in this position during Operations Desert Shield and Desert Storm as the Pacific Fleet supported forward deployed operations.