What term refers to forces from two or more services?

The term that specifically refers to forces from two or more services is "Unified Combatant Command" (COCOM). This designation describes a command structure established by the Department of Defense that integrates different military branches, such as the Army, Navy, Air Force, and Marines, to achieve a unified objective. COCOMs are responsible for conducting operations across the spectrum of military action, and their establishment emphasizes the importance of collaboration and synergy among various service branches.

The other options indicate different types of commands or task forces with varying levels of integration and mission focus. A Joint Task Force (JTF) is a temporary grouping of forces from multiple services around a specific mission, but it is not necessarily a permanent integration like a COCOM. A Combined Joint Task Force (CJTF) involves multinational forces from different nations working together, but its focus is more on international collaboration rather than the specific combination of U.S. services. An Interagency Task Force (ITF) involves multiple U.S. government agencies working together, which does not directly relate to military forces from different services. Therefore, COCOM is the most accurate term for forces from two or more military services.