Matters which variant you're talking aboutKeep in mind there's over 80,000 of them, a lot of them receive upgrades in armorEarly Vietnam ones didn't have that much armor, it was basically small arms fire, 7.62x39mm, 7.62x54mm, and 7.62x51mm armor piecing rounds wouldn't go threw itSame with some shell splinters and OG-7V Fragmentation RPG-7 roundsVariants like the M113A3 Gavin received some steel plates and other armor upgrades plus with thicker aluminium alloy armor which can survive larger caliber rounds such as the .50 BMG and 14.5mm armor piecing rounds and better protection against large artillery shell splinters and explosivesProblem with the M113A3 is the fact it's too heavy to swim and be air drop unlike the light Vietnam onesEDIT: Grenades wouldn't do damage to itKeep in mind that a grenade works by exploding, releasing shrapnel everywhere to wound or seriously hurt a soldier, shrapnel is just meant to peice the body, it has problems going threw body armor, they would only leave scratches on the M113's armor.
It should work just fineJust be sure they get cooked up to the proper temperatureI wouldn't cook them too fast either or they will burn before the inside gets doneGood luck!
I would wrap them in a foil packet for like 10 minutes and place them on the grill, first so that they can heat throwthen grill them just enough to give them a little crunchThey should be pretty greatI'd try one! Good luck.
When it's hot outside or you're camping Ingredients 1 1/3 cups Uncooked instant rice 1/3 cup Sliced fresh mushrooms 1/4 cup Chopped green pepper 1/4 cup Chopped onion 1/2 cup Chicken broth 1/2 cup Water 1/3 cup Ketchup 1 tablespoon Butter or margarine Preparation In a 9-inround aluminum foil pie pan, combine the first seven ingredientsDot with butterCover with heavy-duty foil; seal edges tightlyGrill, covered, for 14-15 minutes or until liquid is absorbedFluff with a fork and serve immediately.