What is the integration of forces from two or more US military services to achieve a unified objective?

The integration of forces from two or more US military services to achieve a unified objective is known as "joint." This term reflects the collaborative efforts of various branches of the military, such as the Army, Navy, Air Force, and Marines, working together towards a common goal. Joint operations leverage the unique capabilities and strengths of each service, ensuring a more effective and efficient approach to mission accomplishment.

In this context, joint operations are fundamental to modern military strategy, focusing on interoperability and coordinated efforts, which are essential for success in complex environments. This cooperative approach enhances operational effectiveness and fosters streamlined communications and resource sharing among the different services.

The other options describe different forms of collaboration but do not specifically refer to the integration of multiple US military services. Interagency typically involves cooperation among different federal agencies, intergovernmental refers to interactions between governmental entities, often across different countries, and multinational involves collaborations with foreign military services. Each of these concepts plays a significant role in broader military operations but does not specifically denote the merging of forces within U.S. military branches to achieve shared objectives.