In which category would the sharing of operational tactics best fit?

The sharing of operational tactics best fits in Category 3, which encompasses technical data and operational information. This category is specifically designated for information that has implications for military operations, including tactics, techniques, and procedures used by military forces in the execution of their missions.

Operational tactics are crucial to understanding how armed forces effectively engage in combat or carry out operations. Sharing this type of information can significantly impact military effectiveness and readiness. As a result, careful consideration and adherence to the established procedures for foreign disclosure are critical to ensure that sensitive operational capabilities and methodologies are protected from potential adversaries.

The other categories refer to different types of information that are either less directly related to operational information or pertain to classified materials, such as basic technical data or less sensitive administrative details. Hence, those options do not adequately capture the specific nature of operational tactics like Category 3 does.