Elon's SpaceX Starship:
Closeup of Ship 38 landing, after surviving a Mach 25 re-entry.
Heat shield tiles were removed from certain hotspots, including areas with bare stainless steel. To test the ablative areas, and also to test how resistant to erosion the stainless steel is during re-entry.
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Each Block 2 ship flew a unique pattern of missing heatshield tiles