Apparently we have this:
"The Philadelphia Naval Shipyard's inland, freshwater location made it ideal for warehousing inactive ships of the Navy's Atlantic Reserve fleet."
So, yeah.
"The Commonwealth's industrial plants manufactured everything from tanks and battleships to radio crystals, parachutes, rations, and 100-octane aircraft fuel. The scale of production was staggering. Steel mills across the state churned out about one-third of the nation's steel and one-fifth of the world supply. Bethlehem Steel and its subsidiaries around the country produced more steel than the Axis powers combined, and contributed greatly to rapid construction of the two-ocean navy needed to win the war."
HAH.