Rations
From Halopedia, the Halo wiki
On the The Armory (Level) while you are still in the armoury you will see five cylindrical tins each containing food. there are three on the table with the shotgun ammo on and another two on a small table behind the target practice.
They Contain
Beans W/ Rice & Bacon X10@2/3C
Pork Ribs/Boneless/in BBQ X10@2R
Peach Dessert. Salty X10@2/3C
Beef Stew Lumpy Gravy X9@1 1/4C