Corn based ethanol would like a word. Also, it’s ironic to me that subsidized industrial monoculture has a number of insecurity producing effects:

1. Topsoil loss 2. Mismanagement of surface water and subsurface reserves 3. Centralization and consolidation, decimating rural communities which would be producing more labor intensive food in a crisis 4. Lower biodiversity, increased risk of catastrophic loss 5. The whole system relies on global trade to make useful food anyway

If national security were the actual driving force, farm policy would look a lot different.