(Editor's note: This story has been corrected to reflect that the Pentagon will need at least an addtional $10 billion annually to pay for nuclear modernization starting in 2021.) Figuring out how to fund the upcoming nuclear modernization bow wave will be the greatest acquisition challenge facing the next administration, according to Pentagon Comptroller Mike McCord. During a Nov. 13 media roundtable at the Pentagon, McCord said the need to have at least an additional $10 billion per year...