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.

China is working on a similar system for its future carriers. Donald Trump may want to go back to 1920s-level technology, but the rest of the world isn't.

It is utterly inappropriate for the president Donald Trump to be weighing in the design and acquisitions process of carrier ships at this level. Had a Democratic president done this kind of micromanagement, all the more so in public, Republican defense wonks would have been apoplectic. Instead ... crickets.

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.

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.

I do think we are seeing the definition of what is a carrier changing. You can turn America-class amphibious assault ships into smaller, less expensive versions of carriers. You can equip surface ships like destroyers as well as submarines with not just missiles and torpedoes but drones than can do roles traditionally performed by carrier aircraft, like surveillance or even strike, such as finding and taking out opponents' missile batteries.