Hello
This is a little more common than people realise. In my book "Extreme Weather" 2007 by H Michael Mogil, a picture is provided on Page 152 of the space shuttle Atlantis hit by hail as it sat on the launch pad at Cape Kennedy on February 27, 2007.
The article states:-
"On February 27 2007, large hail (Up to the size of golf balls) pummelled the Space Shuttle Atlantis on the launch pad at Cape Kennedy Space Centre in Florida. The hail put more than 7,000 dings into the foam covered fuel tank and caused a launch delay of more than 3 months while the damage was repaired and the space craft inspected for safety. According to Wayne Hale (Perfect last name) the shuttle's program manager, the storm did the worst damage we've ever seen from hail".
Harley Pearman