Presented at the 10th annual Data Harmony Users Group meeting on Tuesday, February 11, 2014 by Marcie Zaharee of the MITRE Corporation. Describes the use of Data Harmony Thesaurus Master by the NGA-DCGS Metadata Harmonization (MDH) project to create and manage the Intelligence Surveillance Reconnaissance (ISR) Operations taxonomy. The results of the project suggest that an ISR Operations taxonomy can be built, exported, and shared with the DoD and intelligence communities in a format that both users and systems can understand, and that the taxonomy can serve as an aid in populating metadata fields to increase discovery of data assets.