Exhibit 24
                           LIMITED POWER OF ATTORNEY
                                      FOR
                              ROCKET LAB USA, INC.
                             SECTION 16(a) FILINGS

    Know all by these presents, that the undersigned hereby constitutes and
appoints each of Adam Spice and Robert M.P. Hurwitz, each signing singly, 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 officer, director and/or stockholder of Rocket Lab USA,
        Inc. (the "Company"), Forms ID, 3, 4, and 5 and amendments thereto in
        accordance with Section 16(a) of the Securities Exchange Act of 1934, as
        amended (the "Exchange Act"), 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
        Form ID, 3, 4, or 5 or amendment thereto and timely file such form with
        the United States Securities and Exchange Commission (the "SEC") and any
        stock exchange or similar authority; and

    (3) take any other action of any type whatsoever which, in the opinion of
        such attorney-in-fact, may be necessary or desirable in connection with
        the foregoing authority, 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.

    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 the Company assuming, any of the undersigned's responsibilities to comply
with Section 16 of the Exchange Act.

    This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms ID, 3, 4, and 5 with respect to
the undersigned's holdings of and transactions in securities of the Company,
unless earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact.  This Power of Attorney shall expire as to any
individual attorney-in-fact if such attorney-in-fact ceases to be an employee of
the Company. This Power of Attorney may be filed with the SEC as a confirming
statement of the authority granted herein.

    IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 24th day of August, 2021.


                                        Signature:  /s/ Shaun O'Donnell
                                                    -----------------------

                                        Print Name: Shaun O'Donnell
                                                    -----------------------