Crypto and Purging

[WelshBanana]

Is your enhancement related to a problem?
A clear and concise description of what the enhancement entails. Ex. [...] would improve user experience.
No, I'd like to see the functionality to the EPurge knob button position.

Solution you'd like:
A clear and concise description of what you want to happen.
When the knob is placed the the purge position the radio should wipe and 'drop' all of its fill. Making it useless for any enemies that then collect the radio's. Additionally I'd like to see a clear hail button so that a radio that has dropped it's fill is still able to contact an designated emergency recipient.

Additional context:
Add any other context or screenshots about the enhancement here.

When in 'Z-ALL' or 'CLR' position the radio should no longer retain its fill and be wiped of any data such as presets and frequency
Would also be a good idea to have cryptographic 'guns' (Red/Black) so that certain 'default' presets can be programmed to radios via the data (J3) slot.