# Chronology Summary

## Early Sequencing Logic
- FFG first to close frigate/ASW gap.
- CAG second to replace cruiser-level command/strike capacity.
- DDG third to phase with legacy DDG retirement timeline.

## Program Rhythm
- Block-based technology insertion.
- Fallback systems used until advanced systems are certified.
- Refit cadence begins five years after commissioning and repeats continuously.