SC 14D1/A

                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549
                                ________________
                                SCHEDULE 14D-1/A

                   Tender Offer Statement Pursuant to Section
                14(d)(1) of the Securities Exchange Act of 1934
                               (Amendment No. 9)
                               __________________
                               COMSAT CORPORATION
                           (Name of Subject Company)

                                  REGULUS, LLC
                          LOCKHEED MARTIN CORPORATION
                                   (Bidders)

                        Common Stock, Without Par Value
                         (Title of Class of Securities)

                                   20564D107
                     (CUSIP Number of Class of Securities)

                             STEPHEN M. PIPER, ESQ.
                          LOCKHEED MARTIN CORPORATION
                              6801 ROCKLEDGE DRIVE
                            BETHESDA, MARYLAND 20817
                                 (301) 897-6000
                 (Name, Address and Telephone Number of Person
     Authorized to Receive Notices and Communications on behalf of Bidders)

                                    COPY TO:
                              DAVID G. LITT, ESQ.
                             O'MELVENY & MYERS LLP
                             555 13TH STREET, N.W.
                                 SUITE 500 WEST
                          WASHINGTON, D.C.  20004-1109
                                 (202) 383-5300


                           CALCULATION OF FILING FEE

Transaction Valuation(1):  $1,169,509,386     Amount of Filing Fee:  $233,901

(1)  Estimated for purposes of calculating the amount of the filing fee only.
     The amount assumes the purchase of 25,703,503 shares of common stock,
     without par


     value (the "Shares"), of COMSAT Corporation (the "Company") at a price per
Share of $45.50 in cash (the "Offer Price").  Such number of shares represents
49% of the shares of Common Stock of the Company outstanding as of September 11,
1998, minus the number of shares of the Series II Common Stock of the Company
outstanding as of September 11, 1998.

[x]  Check box if any part of the fee is offset as provided by Rule 0-11(a)(2)
     and identify the filing with which the offsetting fee was previously paid.
     Identify the previous filing by registration statement number, or the form
     or schedule and the date of its filing.

Amount previously paid:  $233,901   Filing Parties:  Regulus, LLC and
                                                     Lockheed Martin Corporation

Form or registration no.:  Schedule 14D-1      Date Filed: September 25, 1998

                        (Continued on following page(s))


     This Amendment No. 9 to the Tender Offer Statement on Schedule 14D-1 (the
"Schedule 14D-1") amends and supplements the Schedule 14D-1 of Regulus, LLC, a
single member Delaware limited liability company (the "Purchaser") and a wholly-
owned subsidiary of Lockheed Martin Corporation, a Maryland corporation
("Parent"), in respect of the tender offer (the "Offer") by the Purchaser to
purchase up to 49% (less certain adjustments) of the issued and outstanding
shares (the "Shares") of common stock, without par value, of COMSAT Corporation,
a District of Columbia corporation (the "Company"), at a price of $45.50 per
Share, net to the seller in cash, without interest thereon, upon the terms and
subject to the conditions set forth in the Offer to Purchase dated September 25,
1998 (the "Offer to Purchase") and in the related Letter of Transmittal.  The
Offer is being made pursuant to an Agreement and Plan of Merger dated as of
September 18, 1998, among the Company, Parent and Deneb Corporation, a wholly-
owned subsidiary of Parent.  The Schedule 14D-1 was initially filed with the
Securities and Exchange Commission on September 25, 1998.  Capitalized terms not
defined herein have the meanings assigned thereto in the Schedule 14D-1 and the
Offer to Purchase, which is attached as Exhibit (a)(1) to the Schedule 14D-1.

     The Purchaser and Parent hereby amend and supplement the Schedule 14D-1 as
follows:

ITEM 2.   IDENTITY AND BACKGROUND

     Schedule I to the Offer to Purchase ("Information Concerning the Directors
and Executive Officers of Parent and the Purchaser") is hereby amended to delete
the references to Vincent N. Marafino and Allen E. Murray as Directors of
Parent.  Messrs. Marafino and Murray retired from their positions as Directors
of Parent following Parent's Annual Meeting of Stockholders held on April 22,
1999.

ITEM 10:  ADDITIONAL INFORMATION

     Item 10(f) is hereby amended and supplemented by the addition of the
following paragraphs thereto:

     On June 9, 1999, Parent issued a press release (and filed a Form 8-K with
the Securities and Exchange Commission attaching a copy of the press release)
announcing that a bottom-up financial review resulted in a substantial reduction
of its current earnings outlook for the remainder of 1999 and 2000.  Parent
expects lower earnings per diluted share and lower free cash flow for both of
these periods.  The principal reasons for the revised financial outlook were
increased cost growth, reduced production rates and delivery delays on the C-
130J program; recent launch vehicle failures; and delays of launches and
commercial satellite deliveries.  Parent's earnings outlook also excluded most
of the previously anticipated portfolio shaping gains.

     Parent's press release contains statements that are considered forward-
looking statements under the federal securities laws, including the Private
Securities Litigation Reform Act of 1995, including the statements relating to
projected future financial performance.  Sometimes these statements will contain
words such as "believes," "expects," "intends," "plans" and other similar words.
These statements are not guarantees of Parent's future performance and are
subject to risks, uncertainties and other important factors that could cause
Parent's actual performance or achievements to be materially different from
those Parent may project.

                              (Page 3 of 8 pages)


     As for the forward-looking statements that relate to future financial
results and other projections, actual results will be different due to the
inherent nature of projections and may be better or worse than projected.  Given
these uncertainties, you should not place any reliance on these forward-looking
statements.  These forward-looking statements also represent Parent's estimates
and assumptions only as of the date that they were made.  Parent expressly
disclaims a duty to provide updates to these forward-looking statements, and the
estimates and assumptions associated with them, after the date of the press
release to reflect events or circumstances or changes in expectations or the
occurrence of anticipated events.

     In addition to the factors set forth in Parent's other filings with the
Securities and Exchange Commission (www.sec.gov), the following factors could
affect the forward-looking statements: continued difficulties during space
launches or adverse actions resulting from space industry reviews by the U.S.
military or the Clinton Administration; the timely resolution of the quota
restriction on Proton launches depends on factors outside Parent's control;
continued difficulties with cost growth and performance issues relating to the
C-130J program; the ability for Space Imaging to timely or successfully launch
its second satellite; the ability to achieve or quantify savings for Parent's
customers or Parent in Parent's global cost-cutting program; the ability to
obtain or the timing of obtaining future government awards, the availability of
government funding and customer requirements, economic conditions, competitive
environment, timing of awards and contracts; timing of product delivery and
launches, customer acceptance and the outcome of contingencies including
completion of acquisitions and divestitures, litigation and environmental
remediation, Year 2000 remediation, program performance, the ability to
consummate the COMSAT transaction.  These are only some of the numerous factors
which will affect the forward-looking statements in the press release, many of
which are difficult to predict.

     On June 14, 1999, Parent issued the press release attached hereto as
Exhibit (a)(17) pursuant to which it announced that the Purchaser had extended
the Offer until 12:00 midnight, New York City time on Tuesday, August 31, 1999.
The press release also notes that the Company's 1999 annual meeting of
shareholders at which a proposal to approve the Merger and the Merger Agreement
will be submitted to the shareholders of the Company for their approval has been
postponed from Friday, June 18, 1999 to Friday, August 20, 1999.  The full text
of the press release is incorporated herein by reference.  The terms of the
extended Offer otherwise remain the same as those of the original Offer as set
forth in the Offer to Purchase filed with the Securities and Exchange Commission
on September 25, 1998.  The Offer is being extended because certain required
regulatory and shareholder approvals have not yet been obtained.

     According to First Chicago Trust Company of New York, the depositary for
the Offer, as of the close of business on June 14, 1999, 10,259,266 shares of
Company Common Stock had been validly tendered and not withdrawn pursuant to the
Offer.  None of these shares were tendered pursuant to notices of guaranteed
delivery.

                              (Page 4 of 8 pages)


ITEM 11.       MATERIAL TO BE FILED AS EXHIBITS.

     Item 11 is hereby amended and supplemented by the addition of the following
thereto:

          (a)(17)  Text of Press Release issued June 15, 1999.


                              (Page 5 of 8 pages)


                                   SIGNATURE



     After due inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.



                                    June 15, 1999



                                    REGULUS, LLC



                                    By:  /s/ Marian S. Block
                                         -------------------------------
                                    Name: Marian S. Block
                                    Title: Vice President



                              (Page 6 of 8 pages)


                                   SIGNATURE



     After due inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.



                                    June 15, 1999



                                    LOCKHEED MARTIN CORPORATION




                                    By:  /s/  Marian S. Block
                                         ------------------------------
                                    Name:  Marian S. Block
                                    Title: Assistant Secretary


                              (Page 7 of 8 pages)


                               14D-EXHIBIT INDEX

EXHIBIT   DESCRIPTION
- -------   -----------


(a)(17) Text of Press Release issued June 15, 1999


                              (Page 8 of 8 pages)

EX-99.A.17

                                                                 Exhibit (a)(17)

                                                           For Immediate Release
                                                           ---------------------

LOCKHEED MARTIN TENDER OFFER
FOR COMSAT EXTENDED UNTIL AUGUST 31, 1999


BETHESDA, Maryland, June 15, 1999--Lockheed Martin Corporation (NYSE: LMT) said
today that its wholly owned subsidiary, Regulus, LLC, is extending its offer to
purchase up to 49% (less certain adjustments) of the outstanding shares of
common stock of COMSAT Corporation (NYSE: CQ) at a price of $45.50 per share,
net to the seller in cash, until 12:00 midnight, New York City time, on Tuesday,
August 31, 1999.

The offer previously had been scheduled to expire on July 2, 1999.  The terms of
the extended tender offer otherwise remain the same as those of the original
offer as set forth in the offering materials filed with the Securities &
Exchange Commission on September 25, 1998.  The offer is being extended because
approvals by COMSAT shareholders and certain regulatory agencies have yet to be
obtained.

COMSAT shareholders will vote on a proposal to approve the combination of COMSAT
and a wholly owned subsidiary of Lockheed Martin and the related merger
agreement during COMSAT's 1999 annual meeting of shareholders, now rescheduled
for Friday, August 20.

According to First Chicago Trust Company of New York, the depositary for the
tender offer, as of the close of business on June 14, 1999, 10,259,266 shares of
COMSAT Corporation had been validly tendered and not withdrawn pursuant to the
offer.  None of these shares were tendered pursuant to notices of guaranteed
delivery.

                                     -more-



The Information Agent for the offer is Morrow & Co., Inc., and questions about
the tender offer may be addressed to Morrow at 1/800-566-9061.  The Dealer
Manager is Bear, Stearns & Co., Inc. and questions may be addressed to it at
1/800-762-5237.

The proposed Lockheed Martin/COMSAT strategic combination was announced
September 20, 1998.  Upon completion of the transaction, COMSAT will become an
integral element of Lockheed Martin Global Telecommunications, a new subsidiary
that provides global telecommunications services to corporate and government
customers worldwide.

As explained in the original offering materials, it was fully anticipated that a
significant period of time would elapse between the commencement and
consummation of the offer because of the regulatory approvals required in order
to satisfy the conditions of the offer.  As a result, the parties agreed that
the tender offer expiration date may be extended additional times while such
approvals are sought.  In addition, in view of the need for U.S. congressional
legislation relating to the amendment or repeal of the Communications Satellite
Act of 1962, and for additional regulatory approvals as conditions to the
consummation of the combination, there may be a further significant period of
time between the purchase of shares pursuant to the offer and the consummation
of the combination.  There can be no assurance that any such regulatory
approvals will be obtained or that any such legislation will be enacted, and if
obtained and enacted, there can be no assurance as to the date such approval and
enactment will occur.
                                     # # #

CONTACT: Charles Manor, Lockheed Martin Global Telecommunications, 301/581-2720.
___________________________________________________________________

NOTE:  Statements that are not historical facts are forward-looking statements
made pursuant to the safe harbor provision of the Private Securities Litigation
Reform Act of 1995.  Such forward-looking statements involve risks and
uncertainties that could cause actual results to differ materially from
anticipated results, including the effects of government budgets and
requirements, economic conditions, competitive environment, timing of awards and
contracts; the outcome of contingencies including litigation and environmental
remediation, and program performance in addition to other factors not listed.
See in this regard, the Corporation's filings with the Securities & Exchange
Commission.  The Corporation does not undertake any obligation to publicly
release any revisions to forward-looking statements to reflect events or
circumstances or changes in expectations after the date of this press release or
the occurrence of anticipated events.