Exhibit B: Non-GAAP Measures Definitions & Reconciliations We make reference to “segment operating income (loss),” “segment operating margin,” “adjusted sales and service revenues,” “adjusted segment operating income (loss),” “adjusted segment operating margin,” “adjusted operating income,” “adjusted operating margin,” “adjusted net earnings,” and “adjusted diluted earnings per share." We internally manage our operations by reference to "segment operating income (loss)" and "segment operating margin," which are not recognized measures under GAAP. When analyzing our operating performance, investors should use segment operating income (loss) and segment operating margin in addition to, and not as alternatives for, operating income and operating margin or any other performance measure presented in accordance with GAAP. They are measures that we use to evaluate our core operating performance. We believe that segment operating income (loss) and segment operating margin reflect an additional way of viewing aspects of our operations that, when viewed with our GAAP results, provide a more complete understanding of factors and trends affecting our business. We believe these measures are used by investors and are a useful indicator to measure our performance. Because not all companies use identical calculations, our presentation of segment operating income (loss) and segment operating margin may not be comparable to similarly titled measures of other companies. Adjusted sales and service revenues, adjusted operating income, adjusted operating margin, adjusted segment operating income (loss), adjusted segment operating margin, adjusted net earnings and adjusted diluted earnings per share are not measures recognized under GAAP. They should be considered supplemental to and not a substitute for financial information prepared in accordance with GAAP. We believe these measures are useful to investors because they exclude items that do not reflect our core operating performance. They may not be comparable to similarly titled measures of other companies. Segment operating income (loss) is defined as operating income (loss) for the relevant segment(s) before the FAS/CAS Adjustment and deferred state income taxes. Segment operating margin is defined as segment operating income (loss) as a percentage of sales and service revenues. Adjusted sales and service revenues is defined as sales and service revenues adjusted for the impact of the insurance litigation settlement at the Ingalls segment in second quarter 2015. Adjusted segment operating income (loss) is defined as segment operating income (loss) adjusted for the impacts of the insurance litigation settlement at the Ingalls segment and the goodwill impairment charge at the Other segment in second quarter 2015. Adjusted segment operating margin is defined as adjusted segment operating income (loss) as a percentage of adjusted sales and service revenues. Adjusted operating income is defined as operating income adjusted for the impacts of the insurance litigation settlement at the Ingalls segment and the goodwill impairment charge at the Other segment in second quarter 2015. Adjusted operating margin is defined as adjusted operating income as a percentage of adjusted sales and service revenues. Adjusted net earnings is defined as net earnings adjusted for the after-tax impacts of the insurance litigation settlement at the Ingalls segment and the goodwill impairment charge at the Other segment in second quarter 2015 and the FAS/CAS Adjustment. Adjusted diluted earnings per share is defined as adjusted net earnings divided by the weighted-average diluted common shares outstanding. FAS/CAS Adjustment is defined as the difference between our pension and postretirement plan expense under GAAP Financial Accounting Standards and the same expense under U.S. Cost Accounting Standards (CAS). Our pension and postretirement plan expense is charged to our contracts under CAS. Deferred state income taxes are defined as the change in deferred state tax assets and liabilities in the relevant period. These amounts are recorded within operating income, while the current period state income tax expenses are charged to contract costs and included in segment operating income. We present financial measures adjusted for the FAS/CAS Adjustment and deferred state income tax to reflect the company’s performance based upon the pension costs and state tax expense charged to our contracts under CAS. We use these adjusted measures as internal measures of operating performance and for performance-based compensation decisions.