Exhibit 12 LOCKHEED MARTIN CORPORATION COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES FOR THE THREE MONTHS ENDED MARCH 31, 1998 (In millions, except ratio) EARNINGS: Net earnings $269 Income tax expense 165 Interest expense 213 Amortization of debt premium and discount, net (1) Portion of rents representative of an interest factor 13 ---- Adjusted earnings before taxes and fixed charges $659 ==== FIXED CHARGES: Interest expense $213 Amortization of debt premium and discount, net (1) Portion of rents representative of an interest factor 13 Capitalized interest 2 ---- Total fixed charges $227 ==== RATIO OF EARNINGS TO FIXED CHARGES 2.9 ====