ELT's were discussed way back in the thread. The C5 I think had a jettisonable ELT on the tail fin.
I can't speak for the C-5, but the P-3 certainly has.
Either way, you're right in that the subject of ejectable ELTs has been done to death.
While it might seem unreasonable to suggest that posters making suggestions like that should read the previous 11,000 posts first, they might pause to consider that in a thread that's been running for more than 6 months, almost every conceivable angle has already been explored extensively.