Vice Adm. Melvin G. "Mel" Williams Jr., left, commander of U.S. 2nd Fleet, speaks with Rear Adm. Samuel Perez while visiting Port-au-Prince, Haiti. Several U.S. and international military and non-governmental agencies are conducting humanitarian and disaster relief operations as part of Operation Unified Response after a 7.0-magnitude earthquake caused severe damage in and around Port-au-Prince, Haiti, Jan. 12.