Know by all these presents, that the undersigned hereby
constitutes and appoints Rebecca A. Bauer, Paralegal; David A.
Fox, Director of Financial Reporting; and Jeffrey A. Spindler at
Olshan Grundman Frome Rosenzweig & Wolosky LLP; and signing
singly, as the undersigned's true and lawful attorney-in-fact to:

1.	execute for and on behalf of the undersigned, in the
undersigned's capacity as an executive officer or Director of GenCorp
Inc., Forms 3, 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 and
execute any such Forms 3, 4 or 5, complete and execute any amendment
or amendments thereto, and timely file such form with the United
States Securities and Exchange Commission and any stock exchange or
similar 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, 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 such
attorney-in-fact's discretion.

	The undersigned hereby grants to each such attorney-in-fact
full power and authority to do and perform any and every act and
thing whatsoever requisite, necessary, or proper to be done in the
exercise of any of the rights and powers herein granted, as fully to
all intents and purposes as the undersigned 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
such attorney-in-fact's 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, nor is GenCorp
Inc. assuming, any of the undersigned's responsibilities to comply
with Section 16 of the Securities Exchange Act of 1934.

	This Power of Attorney shall remain in full force and
effect until the undersigned is no longer required to file Forms
3, 4 and 5 with respect to the undersigned's holdings of and
transactions in securities issued by GenCorp Inc., unless earlier
revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact.

	IN WITNESS WHEREOF, the undersigned has caused this Power
of Attorney to be effective as of the 20th day of September, 2011.


					/s/ Christopher C. Cambria
					Christopher C. Cambria