1. Historically, the U.S. Navy specified the SPS-48 across much of its fleet, including for CVN, LHA, and LPD vessels, leaving a large number of units in use 2. The ROAR program is upgrading U.S. Navy ships from the SPS-48E to SPS-48G configuration 3. On new-build ships, the SPS-48G is being replaced by Raytheon's SPY-6 EASR.
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