0000950130-01-502723 S-4/A 4 20010627 NORTHROP GRUMMAN CORP /DE/ 0001133421 3812 954840775 DE 1231 S-4/A 33 333-61506 1668551 1840 CENTURY PK E C/O NORTHROP GRUMMAN CORP LOS ANGELES CA 90067 3105536262 1840 CENTURY PARK EAST C/O NORTHROP GRUMMAN CORP LOS ANGELES CA 90067 NNG INC 20010129 S-4/A 1 ds4a.txt AMENDMENT #3 OF FORM S-4 EX-15.1 2 dex151.txt LETTER FROM INDEPENDENT ACCOUNTANTS EX-23.1 3 dex231.txt INDEPENDENT AUDITOR'S CONSENT EX-23.2 4 dex232.txt INDEPENDANT AUDITORS CONSENT