The deliberate planning process that requires a supported commander to incorporate changes to time-phased force and deployment data (TPFDD) that occur after the TPFDD becomes effective for execution. TPFDD maintenance is conducted by the supported combatant commander in coordination with the supporting combatant commanders, Service components, US Transportation Command, and other agencies as required. At designated intervals, changes to data in the TPFDD, including force structure, standard reference files, and Services’ type unit characteristics files, are updated in Joint Operation Planning and Execution System (JOPES) to ensure currency of deployment data. TPFDD maintenance may also be used to update the TPFDD for Chairman of the Joint Chiefs of Staff or Joint Strategic Capabilities Plan submission in lieu of refinement during the JOPES plan development phase.