Each nuclear facility has a small army onsite, plus full-scale armies that can be summoned within a few minutes by panic button. In the middle of an Iowa cornfi

Each nuclear facility has a small army onsite, plus full-scale armies that can be summoned within a few minutes by panic button. In the middle of an Iowa cornfield. Compare that to the threat environment at sea, plus the logistical difficulties of carrying around that much security. I doubt the Navy can spare a battle group to escort each container ship.