Three Chilean Navy Type 23 frigates will be upgraded with the MK 41 Vertical Launching Systems (VLS) and they will be armed with the Evolved Seasparrow Missiles (ESSMs).
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By U.S. Navy photo by Mass Communication Specialist Seaman Matthew J. Haran [Public domain], via Wikimedia Commons
Raytheon, BAE Systems and Lockheed Martin are the contractors implementing the upgrade.