(Bloomberg) -- The US agency responsible for maintaining and designing the nation’s cache of nuclear weapons was among those breached by a hack of Microsoft Corp.’s SharePoint document management software, according to a person with knowledge of the matter. Most Read from BloombergTrump Awards $1.26 Billion Contract to Build Biggest Immigrant Detention Center in USWhy the Federal Reserve’s Building Renovation Costs $2.5 BillionSalt Lake City Turns Winter Olympic Bid Into Statewide Bond BoomMilan