The aircraft carrier USS Abraham Lincoln returned to its home port in San Diego after nearly 11 months at sea supporting the war in Iran and facing reported poor conditions, food shortages and low morale for the 5,000 sailors on board. The war President Trump pledged would take four to six weeks is now in its eighth month, leading to broader concerns about a U.S. military stretched thin. NBC’s national security reports Courtney Kube reports in this week’s Sunday Focus from the Lincoln.