Congressional appropriators are directing the Navy to perform an evaluation of its ship maintenance backlog. According to the explanatory statement accompanying the fiscal year 2020 defense appropriations bill , the Navy secretary should launch a study of the "underlying causes" of maintenance delays for the service's submarines, aircraft carriers and surface vessels. Lawmakers on the congressional defense panels want the report within 180 days of the defense spending bill becoming law. "This report shall incorporate results-oriented elements, including analytically based...