A UAV project pins its design revision at Rev U by moving the "Current design revision" header from Rev T to Rev U in 27 subsystem README, WBS and TODO files, plus the root README, docs index and tool BOM pointers. The new bom_revU.json is "a row-for-row carry-forward of bom_revT", and "the known BOM lag items remain documented as open." Subsystems keep their own generation names (PCB "Rev T", landing gear "R6", wing "S1g", nacelle "S4c"). The list of work carried into Rev U is "summarised from commit subjects, not signed off," and there is a rev-S git tag but no rev-T.