 On April 10 , 1989 the battleship was visited by the commander of the US 2nd Fleet , then Vice Admiral Jerome L. Johnson , and on April 13 sailed from Norfolk to participate in a fleet exercise in the Caribbean Sea near Puerto Rico . The exercise , titled " FLEETEX 3 @-@ 89 " , began on or around April 17 under Johnson 's command . Iowa served as Johnson 's flagship during the exercise . 
