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The proposed regulations would replace the existing Atlantic Fleet Training and Testing (AFTT) Study Area marine mammal incidental take regulations and associated Letters of Authorization (LOAs) such that they would cover incidental take caused by seven years of training and testing activities instead of five, extending the expiration date from November 13, 2023, to November 13, 2025. The proposed regulations will set forth the permissible methods of taking; other "means of effecting the least practicable adverse impact" on the affected species or stocks and their habitats and, if applicable, on their availability for taking for subsistence uses (i.e., mitigation); and requirements pertaining to the monitoring and reporting of such taking. LOAs issued under the regulations would authorize the take of marine mammals incidental to the Navy's specified training and testing activities to be conducted within the AFTT Study Area (including areas of the western Atlantic Ocean along the east coast of North America, portions of the Caribbean Sea, and the Gulf of Mexico) over the course of seven years.