WASHINGTON — President Donald Trump’s decision to shift the nation’s most advanced aircraft carrier to South America in his campaign against drug cartels is pulling the ship out of the Mediterranean Sea at a time when a tenuous ceasefire between Israel and Hamas has been threatened by new strikes in Gaza.

The U.S. is set to be in the fairly unusual position of having only a single aircraft carrier deployed and none in the waters off both Europe and the Middle East. The change is especially stark after the U.S. joined Israeli strikes on Iran in June and has engaged in some of the most intense combat operations since World War II against Yemen’s Houthi rebels in the Red Sea.

Aircraft carriers, with their thousands of sailors and dozens of warplanes, have long been recognized as one of the

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