How is the term "combined arms" best defined?

The term "combined arms" is best defined as the interaction of multiple military branches in operations. This concept emphasizes the integration of various combat arms, such as infantry, armor, artillery, and aviation, which work together to create a more effective and cohesive fighting force. The key aspect of combined arms is the collaboration between these different branches, allowing them to capitalize on each other's strengths while compensating for weaknesses.

This approach enables forces to conduct coordinated attacks and support operations, ensuring that each branch contributes its unique capabilities to achieve a common objective. For example, when infantry units are supported by artillery fire and air support, they can maneuver more effectively while minimizing enemy resistance, leading to greater operational success.

The other options describe specific elements of military operations but do not capture the full essence of "combined arms." While the employment of non-military forces or coordination between air and naval forces are important, they do not encompass the broader interaction of all military branches that is central to the concept of combined arms.