Which of the following is NOT one of the four operational responsibilities to forces in theater?

• A. theater opening
• B. theater distribution
• C. sustainment
• D. theater medical evacuation

Answer: (D)

The focus is on how theater-level logistics are organized into primary functions that keep forces moving and operating. The four major theater logistics functions are about getting the theater up and running, moving people and materiel where they’re needed, and sustaining those forces over time. Theater opening involves establishing ports, depots, and lines of communication so logistics can flow. Theater distribution covers the actual movement of supplies and personnel within the theater to support operations. Sustainment encompasses ongoing support—fuel, food, maintenance, repair parts, and general services—to keep units in the fight.

Theater medical evacuation, while essential to mission success, is a medical-support capability. It fits under health service support within sustainment rather than standing as one of the primary theater-level operational responsibilities. That’s why it isn’t counted among the four main operational responsibilities.