Document:

<PAGE>

                                                                   EXHIBIT 10.13

                AMENDMENT NO. 2 TO LOAN AND SECURITY AGREEMENT

AMENDMENT NO. 2 dated as of March 5, 2001 to LOAN AND SECURITY AGREEMENT dated
as of December 14, 2000 among COMFORCE CORPORATION, COMFORCE OPERATING, INC. and
UNIFORCE SERVICES, INC. (the "Holding Companies"), certain direct and indirect
subsidiaries of the Holding Companies (the "Other Loan Parties"), the Lenders
whose signatures appear below, TRANSAMERICA BUSINESS CREDIT CORPORATION, as Co-
Agent (the "Co-Agent"), THE CIT GROUP/BUSINESS CREDIT, INC., as Collateral Agent
(the "Collateral Agent") and IBJ WHITEHALL BUSINESS CREDIT CORPORATION, as
Administrative Agent for the benefit of itself and the Lenders (the
"Administrative Agent").

                             Preliminary Statement

 .     The Holding Companies, the Other Loan Parties, the Co-Agent, the
      Collateral Agent, the Administrative Agent, and the Lenders (as defined
      therein) have entered into a Loan and Security Agreement dated as of
      December 14, 2000, as amended as of January 5, 2001 and as may be further
      amended, restated, supplemented or otherwise modified from time to time
      (the "Original Loan and Security Agreement"; terms defined in the Original
      Loan and Security Agreement and not otherwise defined herein shall have
      the meanings assigned thereto in the Original Loan and Security
      Agreement).

 .     The Loan Parties, and Lenders desire to amend the Original Loan and
      Security Agreement as provided herein.

NOW, THEREFORE, in consideration of the premises set forth herein, the Loan
Parties and the Lenders hereby agree as follows:

1.    Amendments. The Original Loan and Security Agreement is, subject to the
satisfaction of the conditions referred to below, amended and restated in its
entirety as follows:

  a.  Paragraph (2) of the Recitals to the Original Loan and Security Agreement
      is amended and restated as follows:

      "Holding Parties and Borrowers desire that Lenders extend a credit
      facility to Borrowers to i) acquire and retire in one or more purchases
      Senior Notes at a discounted purchase price as permitted by this Agreement
      (the 'Senior Note Prepayment' ) and to pay related tax expenses; ii)
      acquire and retire in one or more purchases Senior PIK Notes held by any
      Person not employed by a Loan Party as of the Amendment No. 2 Effective
      Date, at a discounted purchase price as permitted by this Agreement (the
      'Senior PIK Note Prepayment' ) and to pay related tax expenses; iii) to
      refinance certain indebtedness of Borrowers; and iv) to provide financing
      for working capital and for general corporate purposes from time to time
      to Borrowers and their Subsidiaries;".

  b.  the following definitions are added to subsection 1.1 of the Original Loan
      and Security Agreement in their respective proper alphabetical places:

      "'Amendment No. 2' shall mean Amendment No. 2, dated as of March 5, 2001,
      of this Agreement."

      "'Amendment No. 2 Effective Date' shall mean the date on which the
      amendments contemplated by Amendment No. 2 become effective."

      "'Senior PIK Note Prepayment' has the meaning assigned to such term in
      the preamble to this Agreement."

  c.  subsection 1.1 of the Original Loan and Security Agreement is amended by
      amending the definition of "Fixed Charges" appearing therein by adding the
      phrase "and/or the acquisition, prepayment or retirement of Senior PIK
      Notes" immediately after the phrase "non-recurring gain associated with
      the acquisition,

                                       1
<PAGE>

      prepayment or retirement of Senior Notes" appearing therein;

   d. subsection 2.5 of the Original Loan and Security Agreement is amended and
      restated in its entirety as follows:

      "Borrower shall utilize the proceeds of the Revolving Loan solely (i) for
      the Senior Note Prepayment; (ii) for the Senior PIK Note Prepayment; (iii)
      to refinance senior revolving debt of the Borrowers; and (iv) to provide
      working capital and for general corporate purposes from time to time for
      CC and its Subsidiaries. Prior to and as a condition to the making of the
      Revolving Loan, a Borrower Representative will, as of the Closing Date,
      deliver to Administrative Agent a funds flow memorandum detailing how
      funds from the Revolving Loan are to be transferred to particular uses.";

   e. subsection 3.1(M) of the Original Loan and Security Agreement is amended
      by (1) substituting the word "and" after the phrase "Consent
      Solicitations" appearing therein with a comma and (2) adding the phrase
      "and Senior PIK Note Prepayment" immediately after the phrase "Senior Note
      Prepayment" appearing therein;

   f. subsection 4.16 of the Original Loan and Security Agreement is amended by
      (1) substituting the word "and" after the phrase "Consent Solicitations"
      appearing therein with a comma and (2) adding the phrase "and Senior PIK
      Note Prepayment" immediately after the phrase "Senior Note Prepayment"
      appearing therein; and

   g. subsection 7.5 of the Original Loan and Security Agreement is amended by
      amending and restating clause (A) appearing therein in its entirety as
      follows:

      "to effect the Senior Note Prepayment and/or Senior PIK Note Prepayment so
      long as (i) immediately after giving effect to either the Senior Note
      Prepayment and/or Senior PIK Note Prepayment, there shall be Unused
      Availability equal to the sum of (w) $10,000,000 plus (x) the tax expense
      of CC and its Subsidiaries related to any non-recurring gain arising from
      such Senior Note Prepayment and/or Senior PIK Note Prepayment plus (y)
      accrued and unpaid interest (other than interest payable in kind) on the
      Senior Notes and Senior PIK Notes, (ii) the total cost of such Senior PIK
      Note Prepayment, including such tax expenses and all other costs and
      expenses paid or incurred in connection with such Senior PIK Note
      Prepayment shall not exceed $9,000,000, (iii) the total cost of such
      Senior Note Prepayment plus the Senior PIK Note Prepayment, including such
      tax expenses and all other costs and expenses paid or incurred in
      connection with such Senior Note Prepayment and/or Senior PIK Note
      Prepayment shall not exceed $16,500,000 in the aggregate, and (iv) the
      Senior Note Prepayment and/or Senior PIK Note Prepayment shall comply with
      all applicable laws and terms of all agreements (including the Senior
      Notes Indenture and Senior Debentures Indenture) to which CC or any of its
      Subsidiaries is a party or by which any of them is bound; and".

2. Representations and Warranties.  Each Loan Party represents and warrants
(which representations and warranties shall survive the execution and delivery
hereof) to the Lenders that:

   a. no consent of any other person, including, without limitation,
      shareholders or creditors of any Loan Party is required to authorize, or
      is otherwise required in connection with the execution, delivery and
      performance of this Amendment No. 2.

   b. this Amendment No. 2 has been duly executed and delivered by a duly
      authorized officer of each Loan Party, and constitutes the legal, valid
      and binding obligations of such Loan Party, enforceable against such party
      in accordance with its terms, except as enforcement thereof may be subject
      to the effect of any applicable (i) bankruptcy, insolvency,
      reorganization, moratorium or similar law affecting creditors' rights
      generally and (ii) general principles of equity (regardless of whether
      enforcement is sought in a proceeding in equity or at law).

   c. the execution, delivery and performance of this Amendment No. 2 will not
      violate any law, statute or regulation applicable to any Loan Party, or
      any order or decree of any court or governmental instrumentally
<PAGE>

      applicable to such company, or conflict with, or result in the breach of,
      or constitute a default under any contractual obligation of such company,
      including the Loan Documents.

3. Effectiveness. The foregoing amendments contained in this Amendment No. 2 to
the Original Loan and Security Agreement shall become effective upon the
satisfaction in full of the following conditions on a date (the "Effective
Date") on or before March 5, 2001:

   a. this Amendment No. 2 shall have been executed and delivered by each Loan
      Party and the Requisite Lenders as set forth on the signature pages
      hereto;

   b. as of the Effective Date, there shall be continuing no Default or Event of
      Default;

   c. the representations made by the Loan Parties herein and in the Loan
      Documents shall be true in all respects as of the Effective Date (except
      as to any representation or warranty limited to a specific earlier date);
      and

4. Governing Law.  This Amendment No. 2 to the Original Loan and Security
Agreement is being delivered in the State of New York and shall be governed by
and construed in accordance with the laws of the State of New York.

5. Counterparts.  This Amendment No. 2 to the Original Loan and Security
Agreement is being executed by the parties hereto in separate counterparts, each
of which when so executed and delivered shall be deemed an original, but all of
which counterparts together shall constitute but one and the same instrument.

6. Consent. By signing below, each Loan Party consents to the execution and
delivery of this Amendment No. 2 by each other Loan Party and agrees that the
obligations of such Loan Party under the Loan Documents continue in full force
and effect.

7. Miscellaneous. All references in the Loan Documents to the "Loan and Security
Agreement" and in the Original Loan and Security Agreement to "this Agreement,"
"hereof," "herein" or the like shall mean and refer to the Original Loan and
Security Agreement and this Amendment No. 2 (as well as by all subsequent
amendments, restatements, modifications and supplements thereto).

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<PAGE>

IN WITNESS WHEREOF, the Loan Parties, the Lenders, the Co-Agent, the Collateral
Agent and the Administrative Agent have caused this Amendment No. 2 to the
Original Loan and Security Agreement to be executed as of the day and year first
written above.

Holding Parties:              COMFORCE CORPORATION
                              COMFORCE OPERATING, INC.

Borrowers:                    BRENTWOOD OF CANADA, INC.
                              BRENTWOOD SERVICE GROUP, INC.
                              CAMELOT COMMUNICATIONS GROUP, INC.
                              CAMELOT CONTROL GROUP, INC.
                              CLINICAL LABFORCE OF AMERICA, INC.
                              COMFORCE INFORMATION TECHNOLOGIES, INC.
                              COMFORCE TECHNICAL ADMINISTRATIVE SERVICES, INC.
                              COMFORCE TECHNICAL SERVICES, INC.
                              COMFORCE TELECOM, INC.
                              GERRI G., INC.
                              LABFORCE OF AMERICA, INC.
                              PRO SERVICES, INC.
                              PRO UNLIMITED, INC.
                              PRO UNLIMITED SERVICES, INC.
                              SUMTEC CORPORATION
                              TEMPORARY HELP INDUSTRY SERVICING COMPANY, INC.
                              THISCO OF CANADA, INC.
                              UNIFORCE PAYROLLING SERVICES, INC.
                              UNIFORCE PAYROLLING TRI-STATE INC.
                              UNIFORCE SERVICES, INC.
                              UNIFORCE STAFFING SERVICES, INC.

Inactive Subsidiaries:        COMFORCE ACQUISITION 1 CORP.

                   [Signatures Continued on Following Page]

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<PAGE>

                    [Signature page 1 of 2 to Amendment No. 2]

                              For each of the foregoing corporations:

                              By:  __________________________________________
                                   Name:
                                   Title:

                              IBJ WHITEHALL BUSINESS CREDIT CORPORATION, as
                              Administrative Agent and Lender

                              By:   _________________________________________
                                    Name:
                                    Title:

                              THE CIT GROUP/BUSINESS CREDIT, INC.,

                              as Collateral Agent and Lender

                              By:   _________________________________________
                                    Name:
                                    Title:

                              TRANSAMERICA BUSINESS CREDIT CORPORATION, as Co-
                              Agent and Lender

                              By:   _________________________________________
                                    Name:
                                    Title:

                              FLEET CAPITAL CORPORATION, as Lender

                              By:   _________________________________________
                                    Name:
                                    Title:

                   [Signatures Continued on Following Page]

                                       5
<PAGE>

                   [Signature page 2 of 2 to Amendment No. 2]

                              GUARANTY BUSINESS CREDIT CORPORATION, as Lender

                              By:   _________________________________________
                                    Name:
                                    Title:

                              LASALLE BUSINESS CREDIT, INC, as Lender

                              By:   _________________________________________
                                    Name:
                                    Title:

                              THE CHASE MANHATTAN BANK, as Lender

                              By:   _________________________________________
                                    Name:
                                    Title:

                                       6<PAGE>

                                                                 EXHIBIT (10)(c)

                         MINE SAFETY APPLIANCES COMPANY
                         RETIREMENT PLAN FOR DIRECTORS,

                    As Amended Effective as of April 1, 2001
                    ----------------------------------------

            1. Purpose. The purpose of this plan, as originally established
               -------
December 17, 1987, was to provide to each individual serving as a member of the
Board of Directors from time to time (individually referred to as a "Director"
and collectively as the "Board") of Mine Safety Appliances Company (the
"Company"), a lifetime retirement benefit following the attainment of certain
age and service requirements described hereafter. Effective April 1, 2001, the
Plan was amended to freeze benefits as of that date.

            2. Eligibility. A Director who has terminated his or her service on
               -----------
the Board, whether before or after April 1, 2001, after completing at least 5
years of service as a Director shall be entitled to an annual "Retirement
Allowance" during his or her lifetime, as described below, when his or her
combined age and service as a Director, whether before or after April 1, 2001,
satisfy the "Rule of 75". The "Rule of 75" shall be satisfied when the sum of
the Director's age (measured in full and partial years, in increments of
one-twelfth (1/12) year) and the Director's years of service as a Director
(measured in full and partial years, in increments of one-twelfth (1/12) year)
equals or exceeds 75. A Director who has not terminated his or her service but
has satisfied the "Rule of 75" as described herein shall have a vested right to
an annual "Retirement Allowance" during his or her lifetime, as described below.

            3. Retirement Allowance. Subject to Section 4 hereof, the amount of
               --------------------
the annual Retirement Allowance paid to a retired Director shall be equal to
$20,000 multiplied by a fraction of which the numerator is the Director's years
of service (measured as provided in Section 2) as of March 31, 2001 and the
denominator is the Director's years of service (whether before or after March
31, 2001) required to satisfy the "Rule of 75." The amount of the annual
Retirement Allowance, as so computed, for each eligible Director serving on the
Board as of March 31, 2001 is shown in the attached Schedule. The annual
Retirement Allowance shall be paid in four equal installments as of the first
day of each calendar quarter, beginning with the calendar quarter following the
Director's termination of service and including the calendar quarter in which
the Director's death occurs. No Retirement Allowance payments shall be made
following the death of a retired Director.

            4. Effect of Change in Control. Notwithstanding any other provision
               ---------------------------
of this Plan, if a Director is vested in his or her Retirement Allowance on the
date of the Director's termination of service and that termination date occurs
on,
<PAGE>

or within the three-year period immediately following, a Change in Control (as
defined in this Section 4), then, not later than the fifth (5th) business day
following such termination date, the Company shall pay the Director a lump sum
amount equal to the actuarial equivalent of the Director's Retirement Allowance
(in lieu of making payment of such Retirement Allowance in accordance with
Section 3 hereof). For purposes of this Section 4, "actuarial equivalent" shall
be determined using the same assumptions utilized under the Non-Contributory
Pension Plan for Employees of Mine Safety Appliances Company (or successor plan
thereto) immediately prior to the Director's termination date, or, if more
favorable to the Director, immediately prior to the Change in Control.

            Change in Control shall be deemed to have occurred if the event set
            -----------------
forth in any one of the following paragraphs shall have occurred:

                        (I) any Person (as defined in this Section 4) is or
            becomes the Beneficial Owner (as defined in this Section 4),
            directly or indirectly, of securities of the Company (not including
            in the securities beneficially owned by such Person any securities
            acquired directly from the Company or its Affiliates (which term
            shall have the meaning set forth in Rule 12b-2 promulgated under
            Section 12 of the Exchange Act, as defined in this Section 4))
            representing thirty percent (30%) or more of the combined voting
            power of the Company's then outstanding securities, excluding any
            Person who becomes such a Beneficial Owner in connection with a
            transaction described in clause (I) of paragraph (III) below; or

                        (II) the following individuals cease for any reason to
            constitute a majority of the number of directors then serving:
            individuals who, on May 5, 1998, constitute the Board and any new
            director (other than a director whose initial assumption of office
            is in connection with an actual or threatened election contest,
            including but not limited to a consent solicitation, relating to the
            election of directors of the Company) whose appointment or election
            by the Board or nomination for election by the Company's
            shareholders was approved or recommended by a vote of at least
            two-thirds (2/3) of the directors then still in office who either
            were directors on May 5, 1998 or whose appointment, election or
            nomination for election was previously so approved or recommended;
            or

                        (III) there is consummated a merger or consolidation of
            the Company or any direct or indirect subsidiary of the Company with
            any other corporation, other than (I) a merger or consolidation

                                      -2-
<PAGE>

            which would result in the voting securities of the Company
            outstanding immediately prior to such merger or consolidation
            continuing to represent (either by remaining outstanding or by being
            converted into voting securities of the surviving entity or any
            parent thereof), in combination with the ownership of any trustee or
            other fiduciary holding securities under an employee benefit plan of
            the Company or any subsidiary of the Company, at least fifty-one
            percent (51%) of the combined voting power of the securities of the
            Company or such surviving entity or any parent thereof outstanding
            immediately after such merger or consolidation, or (ii) a merger or
            consolidation effected to implement a recapitalization of the
            Company (or similar transaction) in which no Person is or becomes
            the Beneficial Owner, directly or indirectly, of securities of the
            Company representing thirty percent (30%) or more of the combined
            voting power of the Company's then outstanding securities; or

                        (IV) the shareholders of the Company approve a plan of
            complete liquidation or dissolution of the Company or there is
            consummated an agreement for the sale or disposition by the Company
            of all or substantially all of the Company's assets, other than a
            sale or disposition by the Company of all or substantially all of
            the Company's assets to an entity, at least fifty-one percent (51%)
            of the combined voting power of the voting securities of which are
            owned by shareholders of the Company in substantially the same
            proportions as their ownership of the Company immediately prior to
            such sale.

Notwithstanding the foregoing, a Change in Control shall not be deemed to have
occurred by virtue of the consummation of any transaction or series of
integrated transactions immediately following which the record holders of the
common stock of the Company immediately prior to such transaction or series of
transactions continue to have substantially the same proportionate ownership in
an entity which owns all or substantially all of the assets of the Company
immediately following such transaction or series of transactions.

      Beneficial Owner shall have the meaning set forth in Rule 13d-3 under the
      ----------------
Exchange Act.

      Exchange Act shall mean the Securities and Exchange Act of 1934, as
      ------------
amended from time to time.

      Person shall have the meaning given in Section 3(a)(9) of the Exchange
      ------
Act, as modified and used in Sections 13(d) and 14(d) thereof, except that such
term shall

                                      -3-
<PAGE>

not include (I) the Company or any of its subsidiaries, (ii) a trustee or other
fiduciary holding securities under an employee benefit plan of the Company or
any of its Affiliates, (iii) an underwriter temporarily holding securities
pursuant to an offering of such securities, or (iv) a corporation owned,
directly or indirectly, by the shareholders of the Company in substantially the
same proportions as their ownership of stock of the Company, or (v) any
individual or entity [including the trustees (in such capacity) of any such
entity which is a trust] which is, directly or indirectly, the Beneficial Owner
of securities of the Company representing five percent (5%) or more of the
combined voting power of the Company's then outstanding securities immediately
before the date hereof or any Affiliate of any such individual or entity,
including, for purposes of this Plan, any of the following: (A) any trust
(including the trustees thereof in such capacity) established by or for the
benefit of any such individual; (B) any charitable foundation (whether a trust
or a corporation, including the trustees or directors thereof in such capacity)
established by any such individual; (C) any spouse of any such individual; (D)
the ancestors (and spouses) and lineal descendants (and spouses) of such
individual and such spouse; (E) the brothers and sisters (whether by the whole
or half blood or by adoption)of either such individual or such spouse; or (F)
the lineal descendants (and their spouses) of such brothers and sisters.

            5. Source of Payments. This plan shall not be formally funded; a
               ------------------
Director's right to the payment of a Retirement Allowance hereunder, if any,
shall be entirely contractual. The sole source of payment of Retirement
Allowances shall be the general assets of the Company.

            6. Amendment and Termination. This plan may be amended or terminated
               -------------------------
at any time by the Board, except that no such amendment or termination shall
limit or impair the right of any retired Director to the payment of the
Retirement Allowance hereunder or the vested right of any Director to the
payment of the Retirement Allowance.

            IN WITNESS WHEREOF, Mine Safety Appliances Company has caused this
plan, as amended effective as of April 1, 2001, to be executed by its duly
authorized officers this 16/th/ day of March, 2001.

ATTEST:                       MINE SAFETY APPLIANCES COMPANY

      Donald H. Cuozzo        By John T. Ryan III
      ----------------           ------------------------------------
      Secretary                  Chairman and Chief Executive Officer

                                      -4-
<PAGE>

                            Mine Safety Appliances
                        Board of Directors Pension Plan
              Rule-of-75 Benefits Calculated as of April 1, 2001

<TABLE>
<CAPTION>
=================================================================================================================
                                                                          Rule-of-75     Rule-of-75    Rule-of-75
                                      Director    Current     Current       Age at       Service at      Accrued
 Name                   Birthdate       Date       Age        Service     Retirement     Retirement     Retainer
-----------------------------------------------------------------------------------------------------------------
<S>                     <C>           <C>         <C>         <C>         <C>            <C>           <C>
Joseph Calihan          03/01/38      02/26/93    63.1         8.1          65.0           10.0     $      16,200
John Ryan, III          08/06/43      01/27/81    57.7        20.2          57.7           20.2            20,000
Thomas Hotopp           06/29/41      03/11/98    59.8         3.1          65.9            9.2             6,739
Calvin Campbell Jr.     09/01/34      04/27/94    66.6         6.9          67.4            7.7            17,922
Thomas Witmer           04/14/42      06/25/97    59.0         3.8          65.1            9.9             7,677
L. Edward Shaw          07/30/44      12/16/98    56.7         2.3          64.7           10.3             4,466
                                                                                                    -------------

Total                                                                                               $      73,004
=================================================================================================================
</TABLE>

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