All of these problems -- piracy, terrorism, maritime drugs/smuggling, and illegal migration -- have a strong “law enforcement” as well as naval aspect. The nature and relationship between the military (Navy) and civilian law enforcement agencies vary from country to country throughout the Asia-Pacific region. This complicates cooperation, requiring not simply navy-to-navy coordination, but also understanding and interagency coordination between the Navy and civilian maritime law enforcement agencies -- within each country and between countries. The following discussion examines at some length the experience of the U.S. Navy and the U.S. Coast Guard in cooperation in maritime law enforcement, both as a factual datapoint and as for the potential lessons it might hold regarding the need and modalities for broader Asia-Pacific interagency cooperation in safeguarding the security environment of the sea lanes.