Depending on who, what and where.......

K Rations

D Rations

10-in-1 group rations,

Canned C rations

D ration bars

Condiment kit (salt, pepper, mustard, ketchup, and lemon powder)

Emergency Ration - chewing gum, bouillon cubes, instant coffee with
sugar and creamer, Hershey bars, Charms candy, tobacco, and water
purification tablets.

http://www.olive-drab.com/od_rations_d-day.php

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mad