<PAGE>
EXHIBIT 24
POWER OF ATTORNEY
LOCKHEED MARTIN CORPORATION
The undersigned hereby constitutes Marian S. Block and Renata Baker, and
each of them, jointly and severally, his or her lawful attorney-in-fact and
agent, with full power of substitution and resubstitution, for him or her and in
his or her name, place and stead, in any and all capacities, including, but not
limited to, that listed below, to execute and file, or cause to be filed, with
exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission (hereinafter referred to as the "Commission")
one or more registration statements on Form S-8 for the purpose of registering
under the Securities Act of 1933, as amended, (the "Securities Act") securities
to be issued under the COMSAT Corporation Savings and Profit-Sharing Plan and
amendments thereto (including post-effective amendments), and all matters
required by the Commission in connection with such registration statements under
the Securities Act, granting unto said attorneys-in-fact and agents, and each of
them, full power and authority to do and perform each and every act and thing
requisite or necessary to be done as fully to all intents and purposes as he or
she might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, and each of them, or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.
/s/ Norman R. Augustine July 20, 2000
-------------------------
Norman R. Augustine
Director
<PAGE>
POWER OF ATTORNEY
LOCKHEED MARTIN CORPORATION
The undersigned hereby constitutes Marian S. Block and Renata Baker, and
each of them, jointly and severally, his or her lawful attorney-in-fact and
agent, with full power of substitution and resubstitution, for him or her and in
his or her name, place and stead, in any and all capacities, including, but not
limited to, that listed below, to execute and file, or cause to be filed, with
exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission (hereinafter referred to as the "Commission")
one or more registration statements on Form S-8 for the purpose of registering
under the Securities Act of 1933, as amended, (the "Securities Act") securities
to be issued under the COMSAT Corporation Savings and Profit-Sharing Plan and
amendments thereto (including post-effective amendments), and all matters
required by the Commission in connection with such registration statements under
the Securities Act, granting unto said attorneys-in-fact and agents, and each of
them, full power and authority to do and perform each and every act and thing
requisite or necessary to be done as fully to all intents and purposes as he or
she might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, and each of them, or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.
/s/ Marcus C. Bennett July 20, 2000
-----------------------------
Marcus C. Bennett
Director
<PAGE>
POWER OF ATTORNEY
LOCKHEED MARTIN CORPORATION
The undersigned hereby constitutes Marian S. Block and Renata Baker, and
each of them, jointly and severally, his or her lawful attorney-in-fact and
agent, with full power of substitution and resubstitution, for him or her and in
his or her name, place and stead, in any and all capacities, including, but not
limited to, that listed below, to execute and file, or cause to be filed, with
exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission (hereinafter referred to as the "Commission")
one or more registration statements on Form S-8 for the purpose of registering
under the Securities Act of 1933, as amended, (the "Securities Act") securities
to be issued under the COMSAT Corporation Savings and Profit-Sharing Plan and
amendments thereto (including post-effective amendments), and all matters
required by the Commission in connection with such registration statements under
the Securities Act, granting unto said attorneys-in-fact and agents, and each of
them, full power and authority to do and perform each and every act and thing
requisite or necessary to be done as fully to all intents and purposes as he or
she might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, and each of them, or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.
/s/ Vance D. Coffman July 20, 2000
-----------------------------
Vance D. Coffman
Chairman and Chief Executive Officer
<PAGE>
POWER OF ATTORNEY
LOCKHEED MARTIN CORPORATION
The undersigned hereby constitutes Marian S. Block and Renata Baker, and
each of them, jointly and severally, his or her lawful attorney-in-fact and
agent, with full power of substitution and resubstitution, for him or her and in
his or her name, place and stead, in any and all capacities, including, but not
limited to, that listed below, to execute and file, or cause to be filed, with
exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission (hereinafter referred to as the "Commission")
one or more registration statements on Form S-8 for the purpose of registering
under the Securities Act of 1933, as amended, (the "Securities Act") securities
to be issued under the COMSAT Corporation Savings and Profit-Sharing Plan and
amendments thereto (including post-effective amendments), and all matters
required by the Commission in connection with such registration statements under
the Securities Act, granting unto said attorneys-in-fact and agents, and each of
them, full power and authority to do and perform each and every act and thing
requisite or necessary to be done as fully to all intents and purposes as he or
she might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, and each of them, or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.
/s/ Lynne V. Cheney July 20, 2000
-------------------------
Lynne V. Cheney
Director
<PAGE>
POWER OF ATTORNEY
LOCKHEED MARTIN CORPORATION
The undersigned hereby constitutes Marian S. Block and Renata Baker, and
each of them, jointly and severally, his or her lawful attorney-in-fact and
agent, with full power of substitution and resubstitution, for him or her and in
his or her name, place and stead, in any and all capacities, including, but not
limited to, that listed below, to execute and file, or cause to be filed, with
exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission (hereinafter referred to as the "Commission")
one or more registration statements on Form S-8 for the purpose of registering
under the Securities Act of 1933, as amended, (the "Securities Act") securities
to be issued under the COMSAT Corporation Savings and Profit-Sharing Plan and
amendments thereto (including post-effective amendments), and all matters
required by the Commission in connection with such registration statements under
the Securities Act, granting unto said attorneys-in-fact and agents, and each of
them, full power and authority to do and perform each and every act and thing
requisite or necessary to be done as fully to all intents and purposes as he or
she might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, and each of them, or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.
/s/ James F. Gibbons July 20, 2000
------------------------------
James F. Gibbons
Director
<PAGE>
POWER OF ATTORNEY
LOCKHEED MARTIN CORPORATION
The undersigned hereby constitutes Marian S. Block and Renata Baker, and
each of them, jointly and severally, his or her lawful attorney-in-fact and
agent, with full power of substitution and resubstitution, for him or her and in
his or her name, place and stead, in any and all capacities, including, but not
limited to, that listed below, to execute and file, or cause to be filed, with
exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission (hereinafter referred to as the "Commission")
one or more registration statements on Form S-8 for the purpose of registering
under the Securities Act of 1933, as amended, (the "Securities Act") securities
to be issued under the COMSAT Corporation Savings and Profit-Sharing Plan and
amendments thereto (including post-effective amendments), and all matters
required by the Commission in connection with such registration statements under
the Securities Act, granting unto said attorneys-in-fact and agents, and each of
them, full power and authority to do and perform each and every act and thing
requisite or necessary to be done as fully to all intents and purposes as he or
she might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, and each of them, or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.
/s/ Edward E. Hood, Jr. July 20, 2000
-----------------------------
Edward E. Hood, Jr.
Director
<PAGE>
POWER OF ATTORNEY
LOCKHEED MARTIN CORPORATION
The undersigned hereby constitutes Marian S. Block and Renata Baker, and
each of them, jointly and severally, his or her lawful attorney-in-fact and
agent, with full power of substitution and resubstitution, for him or her and in
his or her name, place and stead, in any and all capacities, including, but not
limited to, that listed below, to execute and file, or cause to be filed, with
exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission (hereinafter referred to as the "Commission")
one or more registration statements on Form S-8 for the purpose of registering
under the Securities Act of 1933, as amended, (the "Securities Act") securities
to be issued under the COMSAT Corporation Savings and Profit-Sharing Plan and
amendments thereto (including post-effective amendments), and all matters
required by the Commission in connection with such registration statements under
the Securities Act, granting unto said attorneys-in-fact and agents, and each of
them, full power and authority to do and perform each and every act and thing
requisite or necessary to be done as fully to all intents and purposes as he or
she might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, and each of them, or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.
/s/ Caleb B. Hurtt July 20, 2000
--------------------------
Caleb B. Hurtt
Director
<PAGE>
POWER OF ATTORNEY
LOCKHEED MARTIN CORPORATION
The undersigned hereby constitutes Marian S. Block and Renata Baker, and
each of them, jointly and severally, his or her lawful attorney-in-fact and
agent, with full power of substitution and resubstitution, for him or her and in
his or her name, place and stead, in any and all capacities, including, but not
limited to, that listed below, to execute and file, or cause to be filed, with
exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission (hereinafter referred to as the "Commission")
one or more registration statements on Form S-8 for the purpose of registering
under the Securities Act of 1933, as amended, (the "Securities Act") securities
to be issued under the COMSAT Corporation Savings and Profit-Sharing Plan and
amendments thereto (including post-effective amendments), and all matters
required by the Commission in connection with such registration statements under
the Securities Act, granting unto said attorneys-in-fact and agents, and each of
them, full power and authority to do and perform each and every act and thing
requisite or necessary to be done as fully to all intents and purposes as he or
she might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, and each of them, or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.
/s/ Gwendolyn S. King July 20, 2000
--------------------------------
Gwendolyn S. King
Director
<PAGE>
POWER OF ATTORNEY
LOCKHEED MARTIN CORPORATION
The undersigned hereby constitutes Marian S. Block and Renata Baker, and
each of them, jointly and severally, his or her lawful attorney-in-fact and
agent, with full power of substitution and resubstitution, for him or her and in
his or her name, place and stead, in any and all capacities, including, but not
limited to, that listed below, to execute and file, or cause to be filed, with
exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission (hereinafter referred to as the "Commission")
one or more registration statements on Form S-8 for the purpose of registering
under the Securities Act of 1933, as amended, (the "Securities Act") securities
to be issued under the COMSAT Corporation Savings and Profit-Sharing Plan and
amendments thereto (including post-effective amendments), and all matters
required by the Commission in connection with such registration statements under
the Securities Act, granting unto said attorneys-in-fact and agents, and each of
them, full power and authority to do and perform each and every act and thing
requisite or necessary to be done as fully to all intents and purposes as he or
she might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, and each of them, or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.
/s/ Eugene F. Murphy July 20, 2000
---------------------------
Eugene F. Murphy
Director
<PAGE>
POWER OF ATTORNEY
LOCKHEED MARTIN CORPORATION
The undersigned hereby constitutes Marian S. Block and Renata Baker, and
each of them, jointly and severally, his or her lawful attorney-in-fact and
agent, with full power of substitution and resubstitution, for him or her and in
his or her name, place and stead, in any and all capacities, including, but not
limited to, that listed below, to execute and file, or cause to be filed, with
exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission (hereinafter referred to as the "Commission")
one or more registration statements on Form S-8 for the purpose of registering
under the Securities Act of 1933, as amended, (the "Securities Act") securities
to be issued under the COMSAT Corporation Savings and Profit-Sharing Plan and
amendments thereto (including post-effective amendments), and all matters
required by the Commission in connection with such registration statements under
the Securities Act, granting unto said attorneys-in-fact and agents, and each of
them, full power and authority to do and perform each and every act and thing
requisite or necessary to be done as fully to all intents and purposes as he or
she might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, and each of them, or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.
/s/ James R. Ukropina July 20, 2000
-----------------------------
James R. Ukropina
Director
<PAGE>
POWER OF ATTORNEY
LOCKHEED MARTIN CORPORATION
The undersigned hereby constitutes Marian S. Block and Renata Baker, and
each of them, jointly and severally, his or her lawful attorney-in-fact and
agent, with full power of substitution and resubstitution, for him or her and in
his or her name, place and stead, in any and all capacities, including, but not
limited to, that listed below, to execute and file, or cause to be filed, with
exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission (hereinafter referred to as the "Commission")
one or more registration statements on Form S-8 for the purpose of registering
under the Securities Act of 1933, as amended, (the "Securities Act") securities
to be issued under the COMSAT Corporation Savings and Profit-Sharing Plan and
amendments thereto (including post-effective amendments), and all matters
required by the Commission in connection with such registration statements under
the Securities Act, granting unto said attorneys-in-fact and agents, and each of
them, full power and authority to do and perform each and every act and thing
requisite or necessary to be done as fully to all intents and purposes as he or
she might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, and each of them, or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.
/s/ Douglas C. Yearley July 20, 2000
------------------------------
Douglas C. Yearley
Director
<PAGE>
POWER OF ATTORNEY
LOCKHEED MARTIN CORPORATION
The undersigned hereby constitutes Marian S. Block and Renata Baker, and
each of them, jointly and severally, his or her lawful attorney-in-fact and
agent, with full power of substitution and resubstitution, for him or her and in
his or her name, place and stead, in any and all capacities, including, but not
limited to, that listed below, to execute and file, or cause to be filed, with
exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission (hereinafter referred to as the "Commission")
one or more registration statements on Form S-8 for the purpose of registering
under the Securities Act of 1933, as amended, (the "Securities Act") securities
to be issued under the COMSAT Corporation Savings and Profit-Sharing Plan and
amendments thereto (including post-effective amendments), and all matters
required by the Commission in connection with such registration statements under
the Securities Act, granting unto said attorneys-in-fact and agents, and each of
them, full power and authority to do and perform each and every act and thing
requisite or necessary to be done as fully to all intents and purposes as he or
she might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, and each of them, or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.
/s/ Robert J. Stevens July 20, 2000
-------------------------
Robert J. Stevens
Executive Vice President and
Chief Financial Officer
<PAGE>
POWER OF ATTORNEY
LOCKHEED MARTIN CORPORATION
The undersigned hereby constitutes Marian S. Block and Renata Baker, and
each of them, jointly and severally, his or her lawful attorney-in-fact and
agent, with full power of substitution and resubstitution, for him or her and in
his or her name, place and stead, in any and all capacities, including, but not
limited to, that listed below, to execute and file, or cause to be filed, with
exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission (hereinafter referred to as the "Commission")
one or more registration statements on Form S-8 for the purpose of registering
under the Securities Act of 1933, as amended, (the "Securities Act") securities
to be issued under the COMSAT Corporation Savings and Profit-Sharing Plan and
amendments thereto (including post-effective amendments), and all matters
required by the Commission in connection with such registration statements under
the Securities Act, granting unto said attorneys-in-fact and agents, and each of
them, full power and authority to do and perform each and every act and thing
requisite or necessary to be done as fully to all intents and purposes as he or
she might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, and each of them, or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.
/s/ Christopher E. Kubasik July 20, 2000
-------------------------------
Christopher E. Kubasik
Vice President and Controller
<PAGE>
POWER OF ATTORNEY
LOCKHEED MARTIN CORPORATION
The undersigned hereby constitutes Marian S. Block and Renata Baker, and
each of them, jointly and severally, his or her lawful attorney-in-fact and
agent, with full power of substitution and resubstitution, for him or her and in
his or her name, place and stead, in any and all capacities, including, but not
limited to, that listed below, to execute and file, or cause to be filed, with
exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission (hereinafter referred to as the "Commission")
one or more registration statements on Form S-8 for the purpose of registering
under the Securities Act of 1933, as amended, (the "Securities Act") securities
to be issued under the COMSAT Corporation Savings and Profit-Sharing Plan and
amendments thereto (including post-effective amendments), and all matters
required by the Commission in connection with such registration statements under
the Securities Act, granting unto said attorneys-in-fact and agents, and each of
them, full power and authority to do and perform each and every act and thing
requisite or necessary to be done as fully to all intents and purposes as he or
she might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, and each of them, or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.
/s/ Louis R. Hughes July 20, 2000
--------------------------
Louis R. Hughes
President and Chief Operating Officer
