| 2001-03-29 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2001-03-29 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2001-03-20 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2001-03-20 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2001-03-07 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2001-03-07 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2001-02-23 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2001-02-23 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2000-08-28 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2000-08-28 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2000-08-14 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2000-08-14 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2000-06-23 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2000-06-23 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2000-05-08 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2000-05-08 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2000-05-02 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2000-05-02 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2000-03-24 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2000-03-24 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2000-01-19 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2000-01-19 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2000-01-10 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 2000-01-10 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-12-08 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-12-08 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-11-04 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-11-04 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-11-01 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-11-01 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-09-01 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-09-01 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-08-23 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-08-23 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-08-11 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-08-11 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-03-05 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-03-05 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-02-18 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-02-18 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-02-01 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-02-01 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-01-20 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-01-20 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-01-14 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1999-01-14 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1998-11-16 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |
| 1998-11-16 | Transfer of control from Northrop Grumman Corporation to NNG, Inc. |