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Offering Circular Supplement (To Base Offering Circular dated October 1, 2004) $563,344,000 Government National Mortgage Association GINNIE MAE® Guaranteed REMIC Pass-Through Securities and MX Securities Ginnie Mae REMIC Trust 2007-033 Class of REMIC Securities Original Principal Balance(2) Interest Rate Principal Type(3) Interest Type(3) CUSIP Number Final Distribution Date(4) The Securities The Trust will issue the Classes of Securities listed on the front cover of this offering circular supplement. The Ginnie Mae Guaranty Ginnie   Mae   will   guarantee   the timely  payment  of  principal  and interest on the securities. The Gin- nie Mae Guaranty is backed by the full faith and credit of the United States of America. The Trust and its Assets The  Trust  will  own  Ginnie  Mae Certificates. The securities may not be suitable investments for you. You should consider carefully the risks of investing in them. See "Risk Factors" beginning on page S-8 which highlights some of these risks. The Sponsor and the Co-Sponsor will offer the securities from time to time in negotiated transactions at varying prices. We expect the closing date to be June 28, 2007. You should read the Base Offering Circular as well as this Supplement. The securities are exempt from registration under the Securities Act of 1933 and are "exempted securities" under the Securities Exchange Act of 1934. AZ ................................    $ 4,149,445 5.5% SUP FIX/Z 38375KEN8 April 2037 BA(1) .......................... 2,194,827 5.5 SUP FIX 38375KEP3 June 2037 BC(1) .......................... 694,741 5.5 SUP FIX 38375KEQ1 June 2037 CF(1)  .......................... 7,889,333 (5) SUP FLT 38375KER9 June 2037 FC(1)  .......................... 25,681,000 (5) TAC FLT 38375KES7 June 2037 IT(1)............................ 32,000,000 (5) NTL (TAC/AD) FLT/IO/DLY/SP(6)    38375KET5 June 2037 LB(1)  .......................... 58,440,000 5.5 PAC FIX 38375KEU2   December 2033 LC(1) .......................... 25,145,000 5.5 PAC FIX 38375KEV0   December 2034 LD(1) .......................... 52,812,000 5.5 PAC FIX 38375KEW8   November 2036 LE  ................................ 19,705,000 5.5 PAC FIX 38375KEX6 June 2037 LI(1)............................ 96,560,000 5.5 NTL (PAC) FIX/IO 38375KEY4 April 2031 LO(1) .......................... 96,560,000 0.0 PAC PO 38375KEZ1 April 2031 OP(1) .......................... 13,090,910 0.0 TAC I/AD PO 38375KFA5 June 2037 PF(1)  .......................... 154,211,000 (5) PAC FLT 38375KFB3 June 2037 PO(1) .......................... 10,472,728 0.0 TAC/AD PO 38375KFC1 June 2037 PS(1)  .......................... 30,842,200 (5) NTL (PAC) INV/IO 38375KFD9 June 2037 ST(1)  .......................... 30,842,200 (5) NTL (PAC) INV/IO 38375KFE7 June 2037 SV  ................................ 187,781,333 (5) NTL (PT) INV/IO 38375KFF4 June 2037 TA ................................ 40,000,000 (5) TAC I/AD INV/DLY/SP(6) 38375KFG2 June 2037 TC ................................ 32,000,000 (5) TAC/AD INV/DLY/SP(6) 38375KFH0 June 2037 TD ................................ 10,000,000 (5) TAC/AD INV/DLY/SP(6) 38375KFJ6 June 2037 TI(1)............................ 40,000,000 (5) NTL (TAC I/AD)    FLT/IO/DLY/SP(6)   38375KFK3 June 2037 UO(1).......................... 3,272,728 0.0 TAC/AD PO 38375KFL1 June 2037 UT(1) .......................... 10,000,000 (5) NTL (TAC/AD)  FLT/IO/DLY/SP(6)   38375KFM9 June 2037 ZB ................................ 1,466,198 5.5 SUP FIX/Z 38375KFN7 April 2037 ZC ................................ 4,750,000 5.5 SUP FIX/Z 38375KFP2 June 2037 ZD ................................ 809,090 5.5 TAC II/AD FIX/Z 38375KFQ0 June 2037 Residual RR ................................ 0 0 NPR NPR 38375KFR8 June 2037 (1)   These Securities may be exchanged for MX Securities described in Schedule I. (2)   Subject to increase as described under "Increase in Size" in this Supplement. The amount shown for each Notional Class (indicated by "NTL" under Principal Type) is its original Class Notional Balance and does not represent principal that will be paid. (3)   As defined under "Class Types" in Appendix I to the Base Offering Circular. The type of Class with which the Class Notional Balance of each Notional Class (other than Class SV) will be reduced is indicated in parentheses. The Class Notional Balance of Class SV will be reduced with the Trust Assets. (4)   See "Yield, Maturity and Prepayment Considerations – Final Distribution Date" in this Supplement. (5)   See "Terms Sheet – Interest Rates" in this Supplement. (6)   These classes have the SP ("Special") designation in their Interest Type because their interest rates may change significantly based on very small changes in the level of LIBOR. See "Terms Sheet – Interest Rates" in this Supplement. CREDIT SUISSE BLAYLOCK & COMPANY, INC. The date of this Offering Circular Supplement is June 21, 2007. B-2