I'd say this about closes the case on Columbia.
Assuming that the orange flecks are from the ET and not spilled Tang.
Mystery tile gives Columbia clue
http://news.bbc.co.uk/2/hi/americas/2800385.stm
I'm extremely dubious of the orbital debris impact claims when there is a tape of foam (plausably ice saturated)
sluffing from the ET and hitting the shuttle on launch as you all well know.
It sound's more like someone is trying to cover their <rear end> or in serious denial.