Defense One – Last week, the Chief of Naval Operations and the Commandant of the Marine Corps got into a rare public dispute. The disagreement revolves around the Navy’s decision to drop a planned purchase of a San Antonio-class amphibious warship from its 2024 budget. While this is about a warship, the impasse arises from a major problem: the Pentagon’s political leaders have thus far failed to articulate a workable long-term vision for naval shipbuilding.