" Sometimes the resulting confusion is merely amusing. Sometimes, it can be downright dangerous."

I challenge you to come up with a situation where a lost possessive apostrophe can be even inconvenient, unless the writer has taken the greatest care to cause ambiguity.

As for the Eighth Army, that kind of screamerese leads to such ambiguities so frequently, that our own dear Frank Muir made quite a secondary career from publishing books of them.