Book excerpt: Operational intelligence, knowledge of the enemy’s location and actions, is crucial to effective military operations. The Admirals’ Advantage offers a revealing look at naval operational intelligence based on the findings of a classified Operational Intelligence (OPINTEL) Lessons-Learned Project and a 1998 Symposium at the Navy and Marine Corps Intelligence Training Center. Participants included senior intelligence and operational leaders who explored the evolution and significance of OPINTEL since World War II. Past and current practices were examined with inputs from fleet and shore commands and insights from interviews and correspondence with senior flag officers and intelligence professionals.