This is an unusual US Coast Guard survival ration w/ no date codes - heck it may not even be 1957 but 58, 59, or even later.. I just know from when I opened it, it had Blue Text Tropical on the Hershey's Tropical bar, and in 1957, H T B's Ingredients are changed. Oat flour is removed. ‘Non fat milk solids’ replace ‘skim milk powder.’ ‘Cocoa powder' replaces ‘cocoa butter.’ (Read from Hershey Community Archive)
I tried 2 large bites - I enjoyed it, and although brittle and somewhat powdery, I was not completely turned off. Not rancid either! This is the oldest chocolate I've ever eaten.
I ate a Jelly Bar... it was fantastic considering it's age. The pieces were hard as a rock, but after sucking on them for about a minute, they softened - and they had nice citrus oil essences and some sweet and mild artificial undertones to them. The Lemon & Orange were my favorite. Green was just ok.
The HUGE hunk of chocolate in this ration still smells good - I put it into my freezer (Wrapped in a grocery bag) and will use it in a chocolate fondue soon - and if it tastes good - I'm doing a full set of photos including me dipping various old mre snacks and also some bananas fresh sliced in it. That is only if this chocolate is still half way decent - otherwise I'll just eat as much as I can before I feel sick depending on it's freshness.

I still have the crackers out on my photo-site.. I just opened this ration today (10-15-14) and I got my hand cut cleaning the inside of the tin and this tin is rusty so I hope I'm up to date on my tetanus shots.
I didn't try the crackers, and I didn't try the large multiple oz hunk of chocolate. I will if you guys want me to.
As for the vitamins, they are probably something I'll just save in my collection. Unless you guys want me to try one.
Finally, the malted milk tablets were missing. I really like malted milk tabs from this era - oldest ones I've ever eaten were from November 1950.
This was a fun one - and I opened it hungry.. like Kman says: Because everything tastes good when you're hungry!
Thanks for looking folks.
-Steve