For all the concerns raised in the presidential campaign about Donald Trump's fitness to command America's nuclear arsenal, the immediate questions he's likely to face as president aren't about launching these weapons, but modernizing them.
He'll have to make politically fraught decisions about a U.S. nuclear arsenal that in some ways has become decrepit.
Among the open questions: Can the U.S. get by with fewer nuclear weapons? Is it time to take some off hair-trigger alert?
Trump's transition website says he "recognizes the uniquely catastrophic threats posed by nuclear weapons and cyberattacks. And it says he will modernize the nuclear arsenal "to ensure it continues to be an effective deterrent."
The questions left unanswered: How much modernization is enough?