Secret's out.For more than a decade, Prudential Financial Inc. has had a confidential arrangement with the U.S. Department of Veterans Affairs to withhold lump-sum payments of life-insurance benefits to the family of dead soldiers, so that Prudential could invest that money and keep whatever cash it made it itself, Bloomberg News reported.The VA failed to inform soldiers and their families of the agreement. Prudential, the second-largest U.S. life insurer is the only provider of life insurance for 6 million U.S. military personnel. The arrangement began in 1999 and was kept confidential until it was put into writing in 2009."Every veteran...