Which fleet is responsible for the eastern half of the Atlantic and Mediterranean Seas?

The correct answer is the 6th Fleet. This fleet is specifically tasked with operations in the eastern half of the Atlantic Ocean and the Mediterranean Sea. The 6th Fleet's area of responsibility includes a wide range of naval operations, exercises, and missions that support U.S. national interests and enhance maritime security in these strategic waterways.

In the context of naval operations, the 6th Fleet plays a crucial role in collaboration with allied nations and in conducting a variety of missions such as maritime security operations, humanitarian assistance, and deterrence of aggression in the region. Understanding the geography and strategic significance of each fleet's operational area is essential for effective naval management and coordination within the broader context of U.S. naval strategy.