What must occur for the U.S. to share personnel deployment details with an allied country?

The sharing of personnel deployment details with an allied country requires approval from the Combatant Commander (COCOM). COCOMs play a critical role in the planning and execution of military operations, including the deployment of personnel. They possess the operational authority and knowledge of the specific mission requirements, the strategic environment, and the potential implications of sharing deployment details with foreign partners.

By involving the COCOM, the process ensures that sharing such sensitive information is consistent with U.S. military objectives and is conducted in a manner that maintains operational security. COCOM approval helps safeguard national security interests while fostering cooperative relationships with allied nations.

Furthermore, other options may relate to different aspects of the military approval process, but the specific authority concerning personnel deployment details strictly falls under the jurisdiction of the COCOM.