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Chief of Naval Research, Rear Adm. Lorin Selby, observes a Vanilla Ultra Endurance unmanned aerial vehicle on Pier 12 during Integrated Battle Problem 21 (UxS IBP 21) Distinguished Visitors day at Naval Base San Diego, April 16. U.S. Pacific Fleet’s UxS IBP 21, April 19-26, integrates manned and unmanned capabilities into the most challenging operational scenarios to generate war fighting advantages.