I'd say that mess tins, or some way to boil water and cook food individually, are essential during any conflict that sees troops living in the boonies, away from the Mess hall and Tim Hortons for long periods of time, viz:
"Bill Wilson and I, always on the look-out for something to supplement our rations, picked and ate what resembled corn cobs from an allotment kept by the local Arabs, which gave us both a violent bout of dysentery, leaving us feeling very weak and washed- out. This was a lesson we learned the hard way and thereafter took great care with what we ate and drank, ensuring that we boiled every drop of water, often after having scooped tiny newts and minute insects out of the mess tin before making our tea, the water perhaps having been taken from a nearby stream. Without fail, the tea tasted like wine to us."
http://www.bbc.co.uk/history/ww2peopleswar/stories/61/a3531061.shtml