Which term is used to describe the combination of different assets collecting against the same intelligence requirement?

The correct term used to describe the combination of different assets collecting against the same intelligence requirement is mixing. Mixing implies taking multiple sources or methods of intelligence gathering and utilizing them collaboratively to create a more comprehensive and accurate picture of the situation at hand. This approach enhances the reliability of the information by corroborating findings from various assets, ultimately leading to more informed decision-making.

Redundancy, while it may involve multiple systems addressing the same intelligence need, typically refers to the duplication of efforts rather than a coordinated attempt to gather a holistic view from varying sources. Integration generally pertains to the incorporation of different systems or information into a unified whole, without specifically emphasizing the collaborative aspect of combining distinct intelligence sources. Synchronization focuses on timing and coordination of activities to ensure that various operations are aligned, rather than on the diverse sources of intelligence themselves. Thus, mixing is the most accurate term for the situation described in the query.