As construction on the first Columbia-class ballistic missile submarine continues, Navy Rear Adm. Scott Pappano, who oversees the program, is emphasizing the importance of the U.S. industrial base and the need for more skilled workers to support the effort. “Principally, I'd say my biggest concern is about workforce, both in our nuclear shipyards and throughout the vendor base that provides material that feeds those shipyards,” Pappano said during a Wednesday forum hosted by the Mitchell Institute for Aerospace Studies. Although...