1. Primary platform for current and future installation is the U.S. Navy's Arleigh Burke (DDG 51) class destroyer, 2. DDG-1000 Zumwalt class destroyer expected to use SQS-60 hull-mounted sonar instead of SQS-53C, 3. Solid maintenance and upgrade market, 4. Environmentalists continue to protest sonar usage and its impact on marine life.
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