What one Predator drone pilot described of his experience fighting in the Iraq war while never leaving Nevada: 'You're going to war for 12 hours, shooting weapons at targets, directing kills on enemy combatants. Then you get in the car and you drive home, and within 20 minutes you're sitting at the dinner table talking to your kids about their homework.'

The best way to create cost overruns in any military acquisition is to change course midstream. That is exactly what Donald Trump wants to do here.

The problem is not just the cost of the ships, but that the swapping was supposed to be quick, but right now it can take days or weeks, which is more like traditional refitting. But the model of modularity and being able to take on different roles is a good one. This is where adding in unmanned systems in the future will be an aid. If they can carry them onboard, whether it be drones to mine or sub-hunting underwater systems, all ships should be able to do such multiple roles simultaneously.

What one Predator drone pilot described of his experience fighting in the Iraq war while never leaving Nevada: 'You're going to war for 12 hours, shooting weapons at targets, directing kills on enemy combatants. Then you get in the car and you drive home, and within 20 minutes you're sitting at the dinner table talking to your kids about their homework.'

Drons change the way politicians think about war. You already have society's barriers against war dropping, and now you have a technology that takes the barriers to the ground. We can carry it out without having to deal with some of the consequences of sending our sons and daughters into harm's way.

Robots are emotionless, so they don't get upset if their buddy is killed, they don't commit crimes of rage and revenge. But ... they see an 80-year-old grandmother in a wheelchair the same way they see a T80 tank; they're both just a series of zeros and ones.

When a robot dies, you don't have to write a letter to its mother.