Amphibious ships have fallen below a readiness rate of 50% due to maintenance and procurement backlogs.
The U.S. continues to strike Houthi militants, who have targeted Israel and American ships in the region.
The Nimitz aircraft carrier, commissioned in 1975, was designed for a 50-year service life.
The aircraft carrier Carl Vinson is being deployed to the Red Sea, where it will help the Harry S. Truman Carrier Strike Group combat Houthi rebels.
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