Captain Zeita Merchant took over from outgoing Commander Jason Tama.
Merchant previously served as the sector's deputy commander.
"I am honored to continue Sector New York's long legacy of excellence, and rest assured that I will continue to meet and exceed the mission at which we are charged," she said.
The New York sector is the Coast Guard's largest operational field command on the east coast.
Its coverage area stretches from Sandy Hook, New Jersey, up the Hudson River to Albany.
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