[Earth]

Prepping for what? Aliens/zombie apocalypse lol?

Realistic things

Wars, Invasions from other countries, Natural disasters, terrorism, etc.

Things that has happened, can happen or is happening.

Prepping does not mean things will happen but its always better to prepare just in case because if it does happen and you have zero preparations to help you through consider yourself dead.

Watch Red Dawn for example even though the likely hood of that actually happening is slim it is still possible and with tensions between other countries getting worse and worse you never know.