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Boxes of Rations
Oh the delights!
Rations come in boxes that last 1 person for 24 Hrs (the 24 Hr pack) or 10 men for 24 Hrs (the 10 man box).
In theory the 10 man box will last one man for 10 days, but only if you are prepared to live on compo Tinned Sausages for one of the days.