Ready Assets U.S.A. Government Money Fund N-CSRS Certified semi-annual shareholder report (management investment company)

Exhibit 99.1350CERT

Certification Pursuant to Rule 30a-2(b) under the 1940 Act and
Section 906 of the Sarbanes Oxley Act

Pursuant to 18 U.S.C. § 1350, the undersigned officer of Ready Assets USA Government Money Fund (the
“registrant”), hereby certifies, to the best of his knowledge, that the registrant's Report on Form N-CSR for
the period ended February 28, 2009, (the “Report”) fully complies with the requirements of Section 15(d)
of the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly
presents, in all material respects, the financial condition and results of operations of the registrant.

Date: April 22, 2009

/s/ Donald C. Burke
Donald C. Burke
Chief Executive Officer (principal executive officer) of
Ready Assets USA Government Money Fund

Pursuant to 18 U.S.C. § 1350, the undersigned officer of Ready Assets USA Government Money Fund (the
“registrant”), hereby certifies, to the best of his knowledge, that the registrant's Report on Form N-CSR for
the period ended February 28, 2009, (the “Report”) fully complies with the requirements of Section 15(d)
of the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly
presents, in all material respects, the financial condition and results of operations of the registrant.

Date: April 22, 2009

/s/ Neal J. Andrews
Neal J. Andrews
Chief Financial Officer (principal financial officer) of
Ready Assets USA Government Money Fund

This certification is being furnished pursuant to Rule 30a-2(b) under the Investment Company Act of 1940, as
amended, and 18 U.S.C. Section 1350 and is not being filed as part of the Form N-CSR with the Securities and
Exchange Commission.