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. ss. 1350, the undersigned officer of WCMA Government
Securities Fund and Master Government Securities LLC (together, the
"Registrants"), hereby certifies, to the best of his knowledge, that the
Registrants' Report on Form N-CSR for the period ended September 30, 2007, (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 each Registrant.

Date: November 20, 2007


/s/ Donald C. Burke
-------------------
Donald C. Burke, Chief Executive Officer (principal executive officer) of
WCMA Government Securities Fund and Master Government Securities LLC


Pursuant to 18 U.S.C. ss. 1350, the undersigned officer of WCMA Government
Securities Fund and Master Government Securities LLC (together, the
"Registrants"), hereby certifies, to the best of his knowledge, that the
Registrants' Report on Form N-CSR for the period ended September 30, 2007, (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 each Registrant.

Date: November 20, 2007


/s/ Neal J. Andrews
-------------------
Neal J. Andrews, Chief Financial Officer (principal financial officer) of
WCMA Government Securities Fund and Master Government Securities LLC

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.