The Navy's latest 30-year shipbuilding plan, sent to Congress today, is affordable for the next five years but thereafter "presents a resourcing challenge" largely due to the multibillion-dollar investment requirements associated with building a new class of nuclear ballistic missile submarines, Deputy Defense Secretary Ashton Carter has told lawmakers. In a letter to Congress sent with the report, Carter certifies that the department's budget plans for fiscal years 2013 to 2017 provide a "sufficient level of funding" to buy the...