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                                                                    EXHIBIT 10.6

                                FIRST AMENDMENT
                                      TO
                        NEWPORT NEWS SHIPBUILDING INC.
                    SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN

     The Newport News Shipbuilding Inc. Supplemental Executive Retirement Plan
(the "Plan") is hereby amended, immediately prior to the Consummation of the
Offer (as defined in the Agreement and Plan of Merger among General Dynamics
Corporation, Grail Acquisition Corporation and Newport News Shipbuilding Inc.
(the "Company"), dated as of April 24, 2001), as follows:

     1.   Section 2.12 is hereby amended in its entirety to read as follows:

          "Final Average Compensation" shall mean the average of the
          Participant's Covered Compensation for any three calendar years (out
          of the five most recent full calendar years, provided that the year in
          which termination of employment occurs may be counted as the most
          recent full calendar year for such purpose) that produces the highest
          average. Covered Compensation shall mean regular base compensation
          during the calendar year plus actual short-term incentive compensation
          earned during the same calendar year. For any calendar year in which a
          Participant was employed by an Employer for only part of the year, the
          regular base compensation during that year will be annualized and
          short-term incentive compensation earned during that year will be
          annualized if the actual award reflected less than a full-year bonus.
          Short-term incentive compensation shall be included as Covered
          Compensation with respect to the calendar year in which it was earned
          by the Participant, without regard to the calendar year in which it
          was paid to the Participant. Short-term incentive compensation shall
          mean only annual bonuses paid or eligible to be paid to the
          Participant in cash based on Company and individual employee
          performance criteria (including amounts paid or payable pursuant to
          the
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          Newport News Shipbuilding Inc. Annual Incentive Plan), and shall not
          include signing bonuses, relocation allowances, long-term incentive
          awards, stock options, performance share grants, expense allowances or
          reimbursements, or any other compensation.

     Full Force and Effect.  Except as expressly amended hereby, the Plan shall
     ---------------------
continue in full force and effect in accordance with the terms thereof on the
date hereof.

     Governing Law.  This Amendment shall be governed by and construed in
     -------------
accordance with the laws of the Commonwealth of Virginia applicable to
agreements made and entirely to be performed within such jurisdiction.

     IN WITNESS WHEREOF, this Amendment is hereby executed this ___day of
_______, 2001.

                                   NEWPORT NEWS SHIPBUILDING INC.

                                   By:_______________________
                                      Vice President, Human
                                      Resources and EH&S

ATTEST:

By:_________________________
Title:<PAGE>

                                                                    EXHIBIT 10.7

                               SECOND AMENDMENT
                                      TO
                        NEWPORT NEWS SHIPBUILDING INC.
                      RETIREMENT BENEFIT RESTORATION PLAN

     The Newport News Shipbuilding Inc. Retirement Benefit Restoration Plan (the
"Plan") is hereby amended, effective immediately prior to the Consummation of
the Offer (as defined in the Agreement and Plan of Merger among General Dynamics
Corporation, Grail Acquisition Corporation and Newport News Shipbuilding Inc.
(the "Company"), dated as of April 24, 2001), as follows:

     1.   Section 2.7 (the definition of "Change in Control") is amended by
          adding a new clause (vi) thereof to read as follows:

          "(vi)  the Consummation of the Offer (as defined in the Agreement and
                 Plan of Merger among General Dynamics Corporation, Grail
                 Acquisition Corporation and the Company, dated as of April 24,
                 2001)."

     2.   Section 3.1(a) is amended by adding the following phrase immediately
          preceding the end thereof:

          "or the employee is in a position designated as ECP Level 5 or above"

     Full Force and Effect.  Except as expressly amended hereby, the Plan shall
     ---------------------
continue in full force and effect in accordance with the terms thereof on the
date hereof.

     Governing Law.  This Amendment shall be governed by and construed in
     -------------
accordance with the laws of the Commonwealth of Virginia applicable to
agreements made and entirely to be performed within such jurisdiction.
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                                                                               2

          IN WITNESS WHEREOF, this Amendment is hereby executed this _____ day
of _______, 2001.

                                   NEWPORT NEWS SHIPBUILDING INC.

                                   By:_______________________
                                      Vice President, Human
                                      Resources and EH&S

ATTEST:

By:_________________________
Title:<PAGE>

                                                                    EXHIBIT 10.8

                              THIRD AMENDMENT TO
                        NEWPORT NEWS SHIPBUILDING INC.
                      RETIREMENT BENEFIT RESTORATION PLAN

     The Newport News Shipbuilding Inc. Retirement Benefit Restoration Plan (the
"Plan") is hereby amended, effective as of the date hereof, as follows:

     1.   Section 2.7 (the definition of "Change in Control") is amended by
          deleting clause (vi) thereof in its entirety and inserting a new
          clause (vi) to read as follows:

          "(vi)  any person and any of its affiliates or associates becomes the
                 beneficial owner, directly or indirectly, of securities
                 representing forty percent (40%) or more of the combined voting
                 power of the Company's then outstanding securities having
                 general voting rights; notwithstanding the foregoing, a Change
                 in Control shall not be deemed to occur pursuant to this clause
                 (vi) solely because forty percent (40%) or more of the combined
                 voting power of the Company's then outstanding securities
                 having general voting rights is acquired by (x) the Company or
                 one or more companies the majority of whose voting common or
                 capital stock is owned directly or indirectly by the Company
                 (y) an employee benefit plan maintained by the Company or one
                 or more companies the majority of whose voting common or
                 capital stock is owned directly or indirectly by the Company or
                 (z) the trustee of the Amended and Restated Stock Employee
                 Compensation Trust, dated as of August 1, 2000, by and between
                 the Company and Wachovia Bank, N.A., as amended."
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     Full Force and Effect.  Except as expressly amended hereby, the Plan shall
     ---------------------
continue in full force and effect in accordance with the terms thereof on the
date hereof.

     Governing Law.  This Amendment shall be governed by and construed in
     -------------
accordance with the laws of the Commonwealth of Virginia applicable to
agreements made and entirely to be performed within such jurisdiction.

          IN WITNESS WHEREOF, this Amendment is hereby executed this _____ day
of _______, 2001.

                                   NEWPORT NEWS SHIPBUILDING INC.

                                   By:_______________________
                                      Vice President, Human
                                      Resources and EH&S

ATTEST:

By:_________________________
Title:<PAGE>

                                                                    EXHIBIT 10.9

                               SECOND AMENDMENT
                                      TO
                        NEWPORT NEWS SHIPBUILDING INC.
                             ANNUAL INCENTIVE PLAN

     The Newport News Shipbuilding Inc. Annual Incentive Plan (the "Plan") is
hereby amended, effective immediately prior to the Consummation of the Offer (as
defined in the Agreement and Plan of Merger among General Dynamics Corporation,
Grail Acquisition Corporation and Newport News Shipbuilding Inc., dated as of
April 24, 2001), as follows:

     1.   Section F of Article V is amended in its entirety to read as follows:

          "F.  Payment of Awards Upon a Change in Control -- Notwithstanding
          anything to the contrary in the Plan, in the event of a Change in
          Control (within the meaning of the Company's Change in Control
          Severance Benefit Plan for Key Executives (the "CIC Severance Plan")):

               (1)  With respect to a Participant who is either (a) the Chairman
          and Chief Executive Officer, (b) the Executive Vice President and
          Chief Operating Officer, (c) the Senior Vice President and Chief
          Financial Officer, (d) the Vice President, General Counsel and
          Secretary, or (e) the Vice President, Human Resources and
          Environmental Health and Safety, such Participant shall receive, as
          soon as practicable following such Change in Control, an amount in
          cash equal to the maximum amount that could be paid as a full year
          (non pro rated) bonus to such Participant under the terms of his or
          her annual award under this Plan for the year in which the Change in
          Control occurs, as if such Participant had remained employed through
          December 31 of such year (regardless of whether such Participant
          actually remains employed through December 31, of such year) and that
          the maximum performance targets were achieved;
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               (2)  With respect to a Participant who is not described in clause
          (1) above and whose employment with the Company is terminated on or
          before December 31 of the year in which a Change in Control occurs (a)
          by the Company other than for Cause, or (b) in the case of a
          Participant who is a participant in the CIC Severance Plan, by the
          Participant as a result of a Constructive Termination (within the
          meaning of the CIC Severance Plan), such Participant shall receive, as
          soon as practicable following such termination, an amount in cash
          equal to the pro rata portion of the greater of (i) the target award
          for the year in which the Change in Control occurs and (ii) the award
          that would be payable for such year based on actual Company
          performance through the date of termination, assuming for such purpose
          that such actual partial year Company performance was treated as
          actual full year Company performance.  The pro rata portion of such
          award shall be a fraction, the numerator of which is the number of
          days elapsed in the year in which the Change in Control occurs through
          the date of termination, and the denominator of which is 365; and

               (3)  With respect to each Participant who is not described in
          clause (1) above and who remains employed with the Company through
          December 31 of the year in which the Change in Control occurs, such
          Participant shall be entitled to receive payment of the Participant's
          award for such year based on the actual performance of the Company for
          such year pursuant to the terms of the award and the Plan as in effect
          immediately prior to such Change in Control, at the time specified in
          Section D of Article V."

     2.   Article X is amended by adding the following immediately preceding the
          end thereof:

          "Notwithstanding anything to the contrary in this Article X, following
          a Change in Control (within the meaning of the CIC Severance Plan)
          neither this Plan nor the terms of any annual award may be amended or
          terminated in any manner that would
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                                                                               3

          reduce the amounts that are (or may become) payable to a Participant
          pursuant to Section F of Article V in respect of the year in which
          such Change in Control occurs."

     Full Force and Effect.  Except as expressly amended hereby, the Plan shall
     ---------------------
continue in full force and effect in accordance with the terms thereof on the
date hereof.

     Governing Law.  This Amendment shall be governed by and construed in
     -------------
accordance with the laws of the Commonwealth of Virginia applicable to
agreements made and entirely to be performed within such jurisdiction.

     IN WITNESS WHEREOF, this Amendment is hereby executed this _____ day of
_______, 2001.

                                             NEWPORT NEWS SHIPBUILDING INC.

                                             By:_______________________
                                                Vice President, Human
                                                Resources and EH&S

ATTEST:

By:_________________________
Title:

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