The Navy says its aging fleet of nuclear-armed submarines can’t last much longer. The Ohio-class subs now doing the job were supposed to be retired years ago. But replacing them is complicated and costly. It’s also the Navy’s top shipbuilding priority. Rear Adm. Joseph Tofalo, the Navy’s director of undersea warfare, spoke about the Ohio replacement program at Sea-Air-Space 2015. He joined Tom Temin and Emily Kopp on the Federal Drive with a preview.

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