Followup-Personal Rescue enclosure

Somebody posted something about the Shuttle programs often touted
"rescue ball" a while back ( I couldn't find the thread). Just
reading my new copy of Walking in Space (David J. Shayler) and he
states p.338. that ,"but although two were built they were never tested
in space and are now in storage. iN 1985 an IAF paper suggested that
there was the capability to use the MMU to transfer these rescue
spheres or a stranded EVA crewman, but that it was never tested
operationally. Again the MMU's have been in storage for
years.".........Doc