Chocolate is great idea. Shame Hershey never did anything with that 'Desert Bar'. They created a limited supply of it for Desert Storm I. It doesnt melt below something like 130 degrees F. And it didnt taste bad either - they were giving away samples that year at the AUSA show in DC. Being young and goofy I found one of the bars 2 years later as I was cleaning out my closet. Unwrapped it and ate it and still tasted good!
Sadly they never made any more. Would be a great thing to have around in a BOB.