Ash Carter: “Undersea dominance is an area of clear American dominance. We want to keep that edge.”

It absolutely is. That's why we quadrupled the European Reassurance Initiative.

Iran's ballistic missile activities pose a significant threat to the Joint Force and our regional allies and partners, particularly Israel.

I can't support, and won't support, is anything that moves towards instability.

"Up-or-out" isn't broken--in fact, it's an essential and highly successful system--but it's also not perfect.