Which command covers almost one-fifth of the planet and includes military relations with NATO?

The US European Command (USEUCOM) is responsible for military relations with NATO and covers a vast area that encompasses almost one-fifth of the planet. This command is crucial for the United States' strategic interests in Europe and surrounding areas, facilitating cooperation with allied nations, particularly through its partnership with NATO. USEUCOM oversees military operations, supports regional stability, and enhances interoperability among NATO allies, which is essential given the historical and current geopolitical dynamics in Europe. Its expansive area of responsibility also includes parts of the Arctic, ensuring that the United States can engage effectively with various security challenges across the continent and engage with international partners in defense initiatives. This emphasis on collaboration and strategic placement highlights why USEUCOM is the appropriate choice in the context of international military operations with NATO relations.