Pursuant to Section 101(a)(5)(A) of the Marine Mammal Protection Act (MMPA), the National Marine Fisheries Service (NMFS), upon application from the U.S. Navy (Navy), plans to issue regulations to govern the unintentional taking of marine mammals, by harassment, incidental to activities conducted in the Atlantic Fleet Training and Testing (AFTT) Study Area. The regulations 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 (i.e., mitigation), and the requirements pertaining to the monitoring and reporting of such taking. Implementation of the above training and testing activities may expose marine mammals present within the AFTT Study Area to sound from active sonar, underwater detonations, and pile driving and removal. NMFS rule cover take of individuals of 45 marine mammal species by Level B (behavioral) Harassment. Further, the rule covered some Level A (injury) harassment and mortality of marine mammal species over the 5-year period.