Assigned to work with the National Military Command Center, the information processing branch of the Joint Chiefs of Staff, Barr rewrote and enhanced FFS, implementing three of its five major components: retrieval, sorting, and file update.
He returned to Washington, D.C., in August 1968 for a tour of duty with the Organization of the Joint Chiefs of Staff as deputy director for operations, National Military Command Center.
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Other designations and nicknames include "The Rock", NMCC-R (for National Military Command Center Reservation), ANMCC (for Alternate National Military Command Center), AJCC (for Alternate Joint Communications Center), "Backup Pentagon", or "Site RT"; the latter refers to the vast array of communication towers and equipment atop the mountain.