Another classic survival ration - the U.S. Army Field Ration D!
A bit sweet for my taste but these bars did disappear very quickly. Dissolving it in hot water makes a rather rich and thick hot chocolate. Currently working on a dark chocolate and chilli version!
I'll be honest, I'm not sure about paraffin wax being an ingredient. It was included in the unofficial recipe I used. Hershey was contracted to develop and make the original D rations and their website doesn't mention any wax. Nor is it listed as an ingredient on the original packaging.
However the D ration had to stand up to being stored and used in areas of high temperatures like the Pacific and desert regions. Adding a fat or wax with a higher melting point than chocolate would help.
Read about it at the Hershey archive
And you can even buy online D ration reproduction packaging, molds and the recipe if you really want.
Bite off more chocolate than you can chew