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                              POWER OF ATTORNEY
                         For Executing Forms 4 and 5


Know all by these presents that the undersigned hereby constitutes and appoints
each Cheryl L. Barr and Matthew G. Colvin, signing singly, his true and lawful
attorney-in-fact to:

	1)	Execute for and on behalf of the undersigned Forms 4 and 5 in
                accordance with Section 16(a) of the Securities Exchange Act of
                1934 and the rules thereunder;

	2)	Do and perform any and all acts for and on behalf of the
                undersigned which may be necessary or desirable to complete
                the execution of any such Form 4 or 5 and the timely filing of
                such form with the United States Securities and Exchange
                Commission and any other authority; and

	3)	Take any other action of any type whatsoever in connection with
                the foregoing which, in the opinion of such attorney-in-fact,
                may be of benefit to, or in the best interest of, or legally
                required by, the undersigned, it being understood that the
                documents executed by such attorney-in-fact on behalf of the
                undersigned pursuant to this Power of Attorney  shall be in such
                form and shall contain such terms and conditions as such
                attorney-in-fact may approve in his/her discretion.


	The undersigned hereby grants to each such attorney-in-fact, full
power and authority to do and perform all and every act and thing whatsoever
requisite, necessary and proper to be done in the exercise of any of the rights
and powers herein granted, as fully to all intents and purposes as such
attorney-in-fact might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or his/her substitute or substitutes, shall lawfully do or
cause to be done by virtue of this power of attorney and the rights and powers
herein granted.  The undersigned acknowledges that the foregoing attorneys-in-
fact, in serving in such capacity at the request of the undersigned, are not
assuming any of the undersigned's responsibilities to comply with Section 16
of the Securities Exchange Act of 1934.

	IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed as of this 27th day of February 2003.



				/s/ Susan Golding
				Susan Golding


Subscribed and sworn to before me on this 27th day of February 2003

State of California		)
				) ss.
County of San Diego		)

						/s/ Mary E. Coleman
Notary Public Seal				Signature of Notary Public