Conquer Club

When I see games listed sometimes certain options are not easily understood.
Two options that I am unsure of are:
Parachute - I think I have a basic idea of this one but would like to learn what it really is.
Nuclear - no idea what this option is.

Most of the other game options are easy to figure out.
I'm not sure if this is the right forum for this request, if not please steer me towards the right group to ask.

Thank you,
Dullkit