Naval forces from 15 partner nations concluded UNITAS 2013, the 54th annual multinational maritime exercise, Sept. 15 in Cartagena, Colombia. Hosted this year by the Colombian navy, UNITAS included naval forces from Brazil, Canada, Chile, Colombia, the Dominican Republic, Honduras, Peru, the United Kingdom and the United States, with observers from Belize, El Salvador, Germany, Jamaica, Panama and Mexico. During 10 days at sea, 19 ships conducted a full spectrum of maritime operations, including electronic warfare, anti-air warfare and air defense, anti-submarine warfare, anti-surface warfare and maritime interdiction operations. By Dialogo September 18, 2013 UNITAS, the longest-running exercise of its type in the world, has evolved and now includes training for many of the threats encountered in the 21st-century maritime environment, along with essential seamanship and navigational skills that are core competencies for maritime services in the Americas. U.S. 4th Fleet was represented by USS Rentz (FFG 46) and other naval units, including Patrol Squadron 10 (VP-10) and Destroyer Squadron 40.