Document:

CHANGE IN TERMS AGREEMENT

Borrower:         US Global Nanospace, Inc.          Lender:  USDR(NV), Inc.
                  f/k/a US Global Aerospace, Inc.
                  2533 N. Carson St., Suite 5107
                  Carson City, NV  89706

Principal:        Amounts up to $500,000.00          Interest Rate:    10.000%

Loan Date:        June 6, 2003

Maturity:         October 31, 2004

Date of Agreement: October 30, 2004

                      DESCRIPTION OF EXISTING INDEBTEDNESS

A Revolving Promissory Note dated June 6, 2003 in original principal amounts up
to $125,000.00, increased for amounts up to $500,000.00 on June 11, 2004.

                         DESCRIPTION OF CHANGE IN TERMS

The maturity date of this Note is being extended to December 31, 2004. All other
terms and conditions remain unchanged.

                                 PROMISE TO PAY

US Global Nanospace, Inc. f/k/a US Global Aerospace, Inc., ("Borrower") promises
to pay to USDR(NV), Inc. ("Lender"), the principal balance then outstanding,
together with interest at the rate of 10.000% per annum on the unpaid principal
balance from June 6, 2003, until paid in full.

                                     PAYMENT

Borrower will pay these loans in one principal payment of the balance then
outstanding, plus interest on or before December 31, 2004. This payment due on
December 31, 2004 will be for all principal and all accrued interest not yet
paid. Unless otherwise agreed or required by applicable law, payments will be
applied first to any accrued unpaid interest, than to principal. Borrower may
pay without penalty all or a portion of the amount owed earlier than it is due.

                             SUCCESSORS AND ASSIGNS

This agreement shall be binding upon and inure to the benefit of the parties,
their successors and assigns.

BORROWER:                               LENDER:

US Global Nanospace, Inc.,              USDR(NV), Inc.
f/k/a US Global Aerospace, Inc.

By: /s/ John Robinson                   By: /s/ Julie Seaman
  ----------------------------------       -------------------------------------
  John Robinson, Chairman                  Julie Seaman, Secretary[LOGO] STONECROFT CAPITAL LLC

PERSONAL & CONFIDENTIAL

September 24, 2004

Michael W. Trudnak Chief Executive Officer Guardian Technologies, Inc. 21351
Ridgetop Circle Suite 300 Dulles, VA 20166

Dear Mike:

Stonecroft Capital LLC is pleased to provide advisory services to your firm
Guardian Technologies, Inc. ("Client") as follows:

      o General strategic business advisory

      o Assist Client with identifying, analyzing and transacting with
appropriate business partners

      o As requested, assist Client with business development activities Please
confirm the engagement of Stonecroft Capital LLC ("Stonecroft") as follows.

1-Fees:

As compensation for services, the Client shall pay to Stonecroft:

      o Retainers: - $20,000 per month, subject to a minimum of 3 months,
payable at the beginning of each monthly period, the first of which is due upon
execution of this letter agreement, plus;

      o Success Fees: - A Success Fee based upon the trailing twelve months'
revenue of the acquired company or the percentage consolidated by Client in the
case of a partial acquisition, as follows: - $250,000; plus - 3% of revenue in
excess of $5 million.

      Success Fees above will be reduced by 20% for an acquisition of Vision
      Technologies, GITI, or Apex. Success fees will be further reduced by an
      additional 10% if any of these acquisitions are consummated, or an
      agreement occurs on all materials terms, within the next 90 days.

            Valid acquisition targets must be pre approved by Guardian; however,
            Guardian will involve Stonecroft in all acquisition activity while
            this engagement is active.

1600 Tysons Boulevard, 8th Floor McLean, Virginia 22102

<PAGE>

      All Success Fees are to be detailed as a closing condition of definitive
      transaction documents and paid promptly in cash as described upon the
      first consummation of definitive transaction documents, during this
      engagement or at any time prior to twelve months following the termination
      of this engagement, if any.

      o During this engagement and for a period of 12 months following
termination of this engagement, Stonecroft will receive a breakup fee of 2% of
the total consideration received by the Client or its shareholders or
debtholders, if Client is acquired (defined as a change of control) in a
transaction where Stonecroft does not receive a Success Fee under a separate
engagement with Client.

      o Stonecroft and Client may at any time mutually agree to substitute
Guardian stock for cash or modify the Retainers or Success Fees outlined above.
.. o In addition to the foregoing fees, the Client will promptly reimburse
Stonecroft for all expenses incurred in connection with services rendered under
this agreement. Such expenses to be limited to less than $1,000 unless
previously approved by Guardian.

2-Information / Confidentiality

In connection with this engagement, Stonecroft and Client may be exposed to each
other's confidential and proprietary information. Both parties agree to use all
reasonable efforts to maintain the confidentiality of such information.

3-Indemnification:

If Stonecroft becomes involved in any action, proceeding or investigation (other
than an action between Stonecroft and the Client) regarding any matter in this
letter, the Client will indemnify Stonecroft against any claims, liabilities or
reasonable expenses to which Stonecroft may become subject (including reasonable
legal and other expenses) unless such claims, liabilities or damages resulted
from Stonecroft's gross negligence or willful misconduct as finally determined
by a court of competent jurisdiction. The Client agrees that this
indemnification shall apply whether or not Stonecroft is a formal party to such
actions. The indemnification and reimbursement obligations of the Client shall
extend to the shareholders, directors, employees and contractors of Stonecroft
(collectively with Stonecroft, the "Indemnified Persons") under the same terms
that exist between Stonecroft and the Client.

No Indemnified Person seeking indemnification under this agreement may settle,
compromise, consent to the entry of any judgment in or otherwise seek to
terminate any action, proceeding or investigation referred to in the preceding
paragraph without Client's prior written consent, which may not be unreasonably
withheld. Promptly after receipt by an Indemnified Person of notice of any
complaint or the commencement of any action or proceeding with respect to which
indemnification is being sought hereunder, such person will notify Client in
writing of such complaint or of the commencement of such action or proceeding.
If Client so elects, Client will assume the defense of such action or
proceeding, including the employment of counsel mutually agreeable to such
Indemnified Person and Client and the payment of the fees and disbursements of
such counsel. However, in the event such Indemnified Person reasonably
determines that (i) having common counsel would present such counsel with a
conflict of interest, (ii) if the defendants in any such action or proceeding
include both an Indemnified Person and Client, and representation by the same
counsel would be inappropriate due to actual or potential differing interests
between them, or (iii) if Client fails to assume the defense of the action or
proceeding in each case in a timely manner having elected to do so, then such
Indemnified Person may employ separate counsel to represent or defend them in
any such action or proceeding and Client will pay the reasonable fees and
disbursements of such counsel, provided, however, that Client will not be
required to pay the fees and disbursements of more than one separate counsel of
all Indemnified Persons in any jurisdiction in any single action or proceeding.

1600 Tysons Boulevard, 8th Floor McLean, Virginia 22102

<PAGE>

4-Other:

Either party may terminate Stonecroft's engagement at any time, with or without
cause, upon written notice to the other party. Upon termination, all retainers
owed, if any, are due. Notwithstanding the foregoing, paragraphs 1, 2, 3, and 4
shall survive any termination of this agreement. This agreement may not be
amended or modified except in writing and shall be governed by the laws of the
State of Virginia. This letter is intended by the parties to be the final
expression of their agreement, and shall supersede any other correspondence,
conversations and understandings relating to the subject matter of this letter.
Any dispute relating to this agreement shall be settled by arbitration according
to the rules of the American Arbitration Association, with any related costs or
attorneys' fees recuperated by the prevailing party.

                                 Yours truly,

                                 STONECROFT CAPITAL, LLC Agreed and accepted:

CLIENT

Signed: /s/ Michael W. Trudnak     Date: September 24, 2004

Name: _______________________ Title: CEO

1600 Tysons Boulevard, 8th Floor McLean, Virginia 22102EXHIBIT 10.52

                        PRBROADCAST CONSULTING AGREEMENT

      This is an agreement dated and effective this 17th day of August,  2004 by
and between B. Michael  Friedman/PRBroadcast Inc., a company organized under the
laws of the State of Florida  having its  principle  office at 205 worth  Avenue
Suite 201, Palm Beach,  Florida 33480 (hereinafter  referred to as The Company),
and Guardian Technology Intl. Inc.., (OTCBB Symbol:  GDTI,  hereinafter referred
to as The Client).

                                    RECITALS

      I. The Client  desires to obtain  financial  consulting  services from The
Company as more particularly  described herein ("Scope of Services and Manner of
Performance").

      II. The Company is in the business of providing such  consulting  services
and has agreed to provide the services on the terms and  conditions set forth in
this agreement.

      Now,  therefore,  in  consideration  of the  faithful  performance  of the
obligations  set forth  herein and other  good and  valuable  consideration  the
receipt and  sufficiency of which are hereby  acknowledged,  The Company and The
Client hereby agree as follows.

                                      TERMS

1. Scope of Services. The Company will perform financial consulting and investor
relations  services on a non exclusive  basis for and on behalf of The Client in
relation to interactions  with  broker-dealers,  shareholders and members of the
public and will  consult  with and advise  The Client on matters  pertaining  to
company  investor/public  relations,   business  modeling  and  development  and
preparation of press releases and will perform services including:

            a. Press Release Dissemination and media Campaigns

            b. Investor and Brokerage conference calls

            c. Media submissions and Radio Campaigns

            d. Analyst Reports.

2. Manner of  performance.  The Company will provide  research on The Client and
distribute Client material to institutions,  portfolio managers, broker-dealers,
financial   advisers  and  other  persons  whom  The  Company   determines,   in
consultation with The Client,  are capable of disseminating  such information to
the general public. The Company will also advise The Client concerning  investor
relations and promotional matters relating to its business. The Company will act
upon The Client's behalf in the investment community, with existing shareholders
and the public. Anything to the contrary not withstanding,  The Company will not
disseminate any information or documentation  relating to The Client without The
Client's written  approval,  which shall be within The Client's sole discretion.
It is expressly agreed and acknowledged that The Company will not be expected to
provide investment advice or recommendations regarding The Client to anyone. The
Company  will  focus  on  contracting  persons,  generally  though  conventional
communications  in order to  familiarize  them with  information  concerning The
Client.  Additionally,  The Company shall be available for advice and counsel to
the officers and directors of The Client at such reasonable and convenient times
and places as may be mutually agreed upon. Except as aforesaid,  the time, place
and manner of  performance  of the services  hereunder,  including the amount of
time allocated by the Company, shall be determined at the sole discretion of The
Company  but,  in any event,  The  Company  shall  allocate  such time as may be
necessary for it to perform its obligations under this Agreement

<PAGE>
                                                                   EXHIBIT 10.52

3. Status of The Company. The Company shall act as an independent contractor and
not as an  agent  or  employee  of The  Client  and The  Company  shall  make no
representation as an agent or employee of The Client.  The Company shall furnish
insurance and be  responsible  for all taxes as an independent  contractor.  The
Company shall have no authority to bind The Client or incur other obligations on
behalf of The Client.  Likewise,  The Client shall have no authority to bind The
Company or incur obligations on behalf of The Company.

4. Disclosure of Material  Events.  The Client agrees to disclose to The Company
in a timely manner those  events/discoveries  which are known and/or anticipated
that may  reasonably  be  expected  to have an  impact  on the  stock,  business
operations,  future business,  or public perception of The Client, as this has a
material  impact on the  ability  and  effectiveness  of The Company and service
rendered.

5. Confidentiality  Agreement.  In the event The Client discloses information to
The Company that The Client  considers to be secret,  proprietary  or non-public
(collectively  "Confidential  Information")  and so notifies  The  Company,  The
Company agrees to hold such Confidential Information in confidence. Confidential
Information  shall be used by The Company only in  connection  with the services
rendered by it under this  Agreement and shall not be  disseminated  without The
Client's written  approval,  which shall be within The Client's sole discretion.
Confidential  Information shall not be deemed to include information which a) is
in or becomes in the public domain  without  violation of this  Agreement by The
Client, or b) is rightfully received from a third entity having no obligation to
The Client to keep such information  confidential and without  violation of this
Agreement.  In  reciprocal,  The Client  agrees to hold  confidential  all trade
secrets of and proprietary methods employed by The Company in fulfillment of the
services it renders  pursuant to this  Agreement  that are  designated  as trade
secrets or proprietary methods by The Company in writing to The Client.

6. Indemnification. The Client agrees to indemnify and hold harmless The Company
against any losses, claims, damages,  liabilities and/or expenses (including any
legal or other expenses  reasonably  incurred in  investigating or defending any
action or claim in respect  thereof) to which The Company is willing and capable
of providing  services on a "Best  Efforts"  basis.  The Company  cannot be held
liable for negative  stock  activity  unless it can be shown that this  activity
comes as a direct  result of  willful,  negligent,  in  appropriate  and illegal
representation or  misrepresentation by The Company. The Company cannot and will
not  provide a guarantee  as to  anticipated  stock  price,  performance  and/or
trading  volume.  The Company  agrees to indemnify  and hold harmless The Client
against any losses, claims, damages,  liabilities and/or expenses (including any
legal or other expenses  reasonably  incurred in  investigating or defending any
action or claim in respect  thereof)  resulting  from the  negligence or willful
misconduct of The Company in the performance of its services hereunder.

<PAGE>

                                                                   EXHIBIT 10.52

7. Conflict of Interest. The Company shall be free to perform services for other
persons  not  engaged  in the  businesses  in which The Client is  engaged.  The
Company will notify The Client prior to performing  consulting  services for any
other  client that could  conflict  with The  Company's  obligations  under this
Agreement,  after which The Client may terminate this Agreement by notice to The
Company within ten business days after receipt of such notice from The Company.

8. Term. Refer to Schedule A.

9. Scope of Services. Refer to Schedule B.

10. Payment. Refer to Schedule C.

11.  Severability.  In the event any part of this agreement  shall be held to be
invalid by any competent  court or arbitration  panel,  this agreement  shall be
interpreted  as if only  that  part is  invalid  and  that the  parties  to this
agreement  will  continue to execute the rest of this  agreement  to the best of
their abilities  unless both parties mutually consent to the dissolution of this
agreement.

12. Representations and Warranties.  Each party hereby represents,  warrants and
covenants  to the other that it is an entity  validly  existing  pursuant to the
laws of the state in which it is organized  and has the full power and authority
to carry out the terms of this  Agreement.  The person signing this Agreement is
duly  authorized  to so execute  the same and this  Agreement  will be valid and
binding on such party in accordance with its terms. The execution,  delivery and
performance of this Agreement will not violate any other agreement or instrument
to which such party is a party.

13.  Governing Law. This Agreement shall be interpreted  accordance with laws of
the State of Virginia.

14. Entire  Agreement.  This  Agreement and attached  schedules  constitute  the
entire contract of the parties with respect to the matters  addressed herein and
no modifications of this Agreement shall be enforceable unless in writing signed
by both The Company and The Client.  This  agreement is not assignable by either
party without the consent of the other.

                           (signature page to follow)
<PAGE>

                                                                   EXHIBIT 10.52

         In witness whereof The Company and The Client have caused this
 agreement to be executed on the date indicated in Schedule A.

PRBroadcast Inc./B.Michael Friedman

/s/ B.Michael Friedman          Title CEO               Date 8/20/04

Guardian Technology Intl Inc.(OTCBB:GDTI)

/s/ R.A. Dishaw                 Title President         Date 8/20/04

<PAGE>

                                   SCHEDULE A

Term of Commitment

(A)  This  Agreement  shall  be for a term of four  (4)  months  unless  earlier
terminated as provided  herein.  The Company shall receive  additional fees on a
pre-approved  in writing  basis by the Client for any  additional  services  not
covered in this Agreement including postage,  travel and administrative expenses
not  covered  by  this  Agreement.  Company  will  work  with  the  Client  on a
non-exclusive basis. This Agreement may be terminated at any time on the express
consent of both parties.

The Company shall commence providing services when it receives the first payment
as outlined in Schedule C, and shall continue accordingly upon timely receipt of
additional payments.

                                   SCHEDULE B

      1)    Introduction  to expanded  shareholder  base through  National Radio
            Show campaigns,  webcast interviews and extensive financial web site
            network.

      2)    Unlimited Industry Press Release drafting and dissemination  through
            Comtex, Knobias, and BusinessWire Network .

      3)    Broker-Dealer  conference calls and dissemination of corporate facts
            sheet to investment community including  broker-dealers,  investment
            funds and clubs, independent investor network.

      4)    CEO interviews via Internet Webcast, and investor email databases.

      5)    Press Release dissemination

                                   SCHEDULE C

PAYMENT FOR SERVICES

$5,000 per month during the term of this  Agreement  beginning  from the date of
execution of this Agreement.

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