ADPO 4-0 primarily establishes the army's principle doctrine for supporting operations. Which option best matches this emphasis?

• A. It guides medical evacuation procedures.
• B. Describes recruitment priorities.
• C. Governs personnel family support programs.
• D. Establishes the army's principle doctrine for supporting operations.

Answer: (D)

ADP 4-0 is about sustainment—the way the Army plans, coordinates, and delivers support to keep operations moving. The option that says it establishes the Army’s principle doctrine for supporting operations fits best because it captures the publication’s overarching purpose: to define how logistics, maintenance, personnel services, health support, and related capabilities are organized and employed to sustain forces in any operation. The other choices describe specific functions or programs (medical evacuation, recruitment priorities, family support) that fall under narrower areas rather than the broad sustainment framework ADP 4-0 establishes.