Exhibit 16

                                POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that the undersigned trustee hereby
constitutes and appoints Nick Bonos and Michael P. Byrum, and each of them
singly, his true and lawful attorneys-in-fact and agents with full power of
substitution and resubstitution, to sign for him and in his name, place and
stead, and in the capacity indicated below, to sign any and all Registration
Statements on N-14 relating to the reorganization of Security Cash Fund into
Rydex U.S. Government Money Market Fund and all amendments , exhibits or
supplements thereto, and to file and/or withdraw the same with all exhibits
thereto and other documents in connection therewith, with the U.S. Securities
and Exchange Commission, granting unto said attorneys-in-fact and agents, and
each of them, acting alone, full power and authority to do and perform each and
every act and thing requisite or necessary to be done in and about the premises,
as fully to all intents and purposes as he might or could do in person, hereby
ratifying and confirming all that said attorneys-in-fact and agents or any of
them, or their substitute or substitutes, may lawfully do or cause to be done by
virtue hereof.

     IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal as
of the date set forth below.

     /s/ JOHN O. DEMARET
     -------------------
     Name: John O. Demaret
     Date:


                                POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that the undersigned trustee hereby
constitutes and appoints Nick Bonos and Michael P. Byrum, and each of them
singly, his true and lawful attorneys-in-fact and agents with full power of
substitution and resubstitution, to sign for him and in his name, place and
stead, and in the capacity indicated below, to sign any and all Registration
Statements on N-14 relating to the reorganization of Security Cash Fund into
Rydex U.S. Government Money Market Fund and all amendments , exhibits or
supplements thereto, and to file and/or withdraw the same with all exhibits
thereto and other documents in connection therewith, with the U.S. Securities
and Exchange Commission, granting unto said attorneys-in-fact and agents, and
each of them, acting alone, full power and authority to do and perform each and
every act and thing requisite or necessary to be done in and about the premises,
as fully to all intents and purposes as he might or could do in person, hereby
ratifying and confirming all that said attorneys-in-fact and agents or any of
them, or their substitute or substitutes, may lawfully do or cause to be done by
virtue hereof.

     IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal as
of the date set forth below.

     /s/ PATRICK T. MCCARVILLE
     -------------------------
     Name: Patrick T. McCarville
     Date:


                                POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that the undersigned trustee hereby
constitutes and appoints Nick Bonos and Michael P. Byrum, and each of them
singly, his true and lawful attorneys-in-fact and agents with full power of
substitution and resubstitution, to sign for him and in his name, place and
stead, and in the capacity indicated below, to sign any and all Registration
Statements on N-14 relating to the reorganization of Security Cash Fund into
Rydex U.S. Government Money Market Fund and all amendments , exhibits or
supplements thereto, and to file and/or withdraw the same with all exhibits
thereto and other documents in connection therewith, with the U.S. Securities
and Exchange Commission, granting unto said attorneys-in-fact and agents, and
each of them, acting alone, full power and authority to do and perform each and
every act and thing requisite or necessary to be done in and about the premises,
as fully to all intents and purposes as he might or could do in person, hereby
ratifying and confirming all that said attorneys-in-fact and agents or any of
them, or their substitute or substitutes, may lawfully do or cause to be done by
virtue hereof.

     IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal as
of the date set forth below.

     /s/ ROGER SOMERS
     ----------------
     Name: Roger Somers
     Date:


                                POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that the undersigned trustee hereby
constitutes and appoints Nick Bonos and Michael P. Byrum, and each of them
singly, his true and lawful attorneys-in-fact and agents with full power of
substitution and resubstitution, to sign for him and in his name, place and
stead, and in the capacity indicated below, to sign any and all Registration
Statements on N-14 relating to the reorganization of Security Cash Fund into
Rydex U.S. Government Money Market Fund and all amendments , exhibits or
supplements thereto, and to file and/or withdraw the same with all exhibits
thereto and other documents in connection therewith, with the U.S. Securities
and Exchange Commission, granting unto said attorneys-in-fact and agents, and
each of them, acting alone, full power and authority to do and perform each and
every act and thing requisite or necessary to be done in and about the premises,
as fully to all intents and purposes as he might or could do in person, hereby
ratifying and confirming all that said attorneys-in-fact and agents or any of
them, or their substitute or substitutes, may lawfully do or cause to be done by
virtue hereof.

     IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal as
of the date set forth below.

     /s/ COREY A. COLEHOUR
     ---------------------
     Name: Corey A. Colehour
     Date:


                                POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that the undersigned trustee hereby
constitutes and appoints Nick Bonos and Michael P. Byrum, and each of them
singly, his true and lawful attorneys-in-fact and agents with full power of
substitution and resubstitution, to sign for him and in his name, place and
stead, and in the capacity indicated below, to sign any and all Registration
Statements on N-14 relating to the reorganization of Security Cash Fund into
Rydex U.S. Government Money Market Fund and all amendments , exhibits or
supplements thereto, and to file and/or withdraw the same with all exhibits
thereto and other documents in connection therewith, with the U.S. Securities
and Exchange Commission, granting unto said attorneys-in-fact and agents, and
each of them, acting alone, full power and authority to do and perform each and
every act and thing requisite or necessary to be done in and about the premises,
as fully to all intents and purposes as he might or could do in person, hereby
ratifying and confirming all that said attorneys-in-fact and agents or any of
them, or their substitute or substitutes, may lawfully do or cause to be done by
virtue hereof.

     IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal as
of the date set forth below.

     /s/ WERNER E. KELLER
     --------------------
     Name: Werner E. Keller
     Date:




                                POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that the undersigned trustee hereby
constitutes and appoints Nick Bonos and Michael P. Byrum, and each of them
singly, his true and lawful attorneys-in-fact and agents with full power of
substitution and resubstitution, to sign for him and in his name, place and
stead, and in the capacity indicated below, to sign any and all Registration
Statements on N-14 relating to the reorganization of Security Cash Fund into
Rydex U.S. Government Money Market Fund and all amendments , exhibits or
supplements thereto, and to file and/or withdraw the same with all exhibits
thereto and other documents in connection therewith, with the U.S. Securities
and Exchange Commission, granting unto said attorneys-in-fact and agents, and
each of them, acting alone, full power and authority to do and perform each and
every act and thing requisite or necessary to be done in and about the premises,
as fully to all intents and purposes as he might or could do in person, hereby
ratifying and confirming all that said attorneys-in-fact and agents or any of
them, or their substitute or substitutes, may lawfully do or cause to be done by
virtue hereof.

     IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal as
of the date set forth below.

     /s/ THOMAS F. LYDON
     -------------------
     Name: Thomas F. Lydon
     Date:


                                POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that the undersigned trustee hereby
constitutes and appoints Nick Bonos and Michael P. Byrum, and each of them
singly, his true and lawful attorneys-in-fact and agents with full power of
substitution and resubstitution, to sign for him and in his name, place and
stead, and in the capacity indicated below, to sign any and all Registration
Statements on N-14 relating to the reorganization of Security Cash Fund into
Rydex U.S. Government Money Market Fund and all amendments , exhibits or
supplements thereto, and to file and/or withdraw the same with all exhibits
thereto and other documents in connection therewith, with the U.S. Securities
and Exchange Commission, granting unto said attorneys-in-fact and agents, and
each of them, acting alone, full power and authority to do and perform each and
every act and thing requisite or necessary to be done in and about the premises,
as fully to all intents and purposes as he might or could do in person, hereby
ratifying and confirming all that said attorneys-in-fact and agents or any of
them, or their substitute or substitutes, may lawfully do or cause to be done by
virtue hereof.

     IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal as
of the date set forth below.

     /s/ CARL G. VERBONCOEUR
     -----------------------
     Name: Carl G. Verboncoeur
     Date:


                                POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that the undersigned trustee hereby
constitutes and appoints Nick Bonos and Michael P. Byrum, and each of them
singly, his true and lawful attorneys-in-fact and agents with full power of
substitution and resubstitution, to sign for him and in his name, place and
stead, and in the capacity indicated below, to sign any and all Registration
Statements on N-14 relating to the reorganization of Security Cash Fund into
Rydex U.S. Government Money Market Fund and all amendments , exhibits or
supplements thereto, and to file and/or withdraw the same with all exhibits
thereto and other documents in connection therewith, with the U.S. Securities
and Exchange Commission, granting unto said attorneys-in-fact and agents, and
each of them, acting alone, full power and authority to do and perform each and
every act and thing requisite or necessary to be done in and about the premises,
as fully to all intents and purposes as he might or could do in person, hereby
ratifying and confirming all that said attorneys-in-fact and agents or any of
them, or their substitute or substitutes, may lawfully do or cause to be done by
virtue hereof.

     IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal as
of the date set forth below.

     /s/ J. KENNETH DALTON
     ---------------------
     Name: J. Kenneth Dalton
     Date: