Which of the following is NOT a function of the combatant commander?

The function of the combatant commander primarily involves overseeing and directing military operations, joint training exercises, and providing strategic guidance to subordinate commands. The role is centered around the integration and coordination of military efforts across different branches of the armed forces to ensure effective responses to threats and challenges.

In this context, the option pertaining to budgeting and procuring service-specific equipment is not typically a function of the combatant commander. This responsibility usually falls under the purview of the respective service branches and their logistics and procurement departments. While combatant commanders may identify requirements and advocate for resources needed to successfully complete their missions, the actual budgeting and procurement processes are managed by the individual services within the guidelines established by the Department of Defense.

Thus, the correct choice highlights a distinction between the roles of operational command versus supply chain and equipment management responsibilities.