I've spent hours upon hours in deuceandahalfs, hueys, blackhawks, chinooks and C130s and don't feel that my kernels broke down at all(I have 8 kids to prove it).
I don't suppose that ammo transported in similar situations that would mimic tumbling has suffered. Seems the crates would be labelled FRAGILE or ammo cans would be stuffed with bubble wrap.
Only going for a little bit of smart-a$$.