RADM (lower half) Theodore C. Lockhart, commander, South Atlantic Force, stands beside a memorial to crew members of the American frigate USS ESSEX who were killed during a 19th century engagement between the ESSEX and the British frigates PHOEBE and CHERUB. Lockhart and other U.S. Navy personnel are in port during Unitas XXXII, a combined exercise involving the naval forces of the United States and nine South American nations