Battle-damaged U.S. warships could not be quickly repaired and returned to combat during a war with China, according to a new report. U.S. maintenance facilities would be overwhelmed and would lack sufficient spare parts to repair ships in theater, concluded the study by RAND, a Washington-based think tank. Nor can the U.S. Navy assume that its Pacific allies have adequate shipyard capacity — or political willingness — to fix damaged vessels. The U.S. Navy has struggled with overworked ships