UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934



                                Telos Corporation
- --------------------------------------------------------------------------------
                                (Name of Issuer)


             12% Cumulative Exchangeable Redeemable Preferred Stock,
                           $0.01 par value per share
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                    8796B200
         --------------------------------------------------------------
                                 (CUSIP Number)


                        Grand Slam Asset Management, LLC
                              2200 Fletcher Avenue
                           Fort Lee, New Jersey 07024
                                 (201) 346-4335
                               Attn: Erik Volfing


- --------------------------------------------------------------------------------
       (Name, Address and Telephone Number of Person Authorized to Receive
                          Notices and Communications)


                                February 7, 2007
         --------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of ss.ss.240.13d-1(e),  240.13d-1(f) or 240.13d-1(g), check the
following box. |_|

Note:  Schedules  filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 13d-7 for other parties
to whom copies are to be sent.

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).


                                                                SEC 1746 (12-91)

CUSIP NO. 8796B200 SCHEDULE 13D - -------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Grand Slam Asset Management, LLC IRS # 22-3779105 - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) |X| Joint Filing (b) - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS* AF - -------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS RE- QUIRED PURSUANT TO ITEM 2(d) OR 2(e) |_| - -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware, USA - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER -0- NUMBER OF -------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY 164,477 EACH -------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH -0- -------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 164,477 - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 164,477 - -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* |_| - -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.16% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON IA - -------------------------------------------------------------------------------- Page 2

CUSIP NO. 987824109 SCHEDULE 13D - -------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Grand Slam Capital Master Fund, Ltd. IRS # 20-0239056 - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) |X| (b) - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS* WC - -------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS RE- QUIRED PURSUANT TO ITEM 2(D) OR 2(E) |_| - -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands - -------------------------------------------------------------------------------- 7 SOLE VOTING POWER -0- NUMBER OF -------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY 164,477 EACH -------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH -0- -------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 164,477 - -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 164,477 - -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* - -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.16% - -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON OO - -------------------------------------------------------------------------------- Page 3

ITEM 1. SECURITY AND ISSUER The title of the class of equity securities to which this statement on Schedule 13D (the "Statement") relates is the 12% Cumulative Exchangeable Redeemable Preferred Stock, par value $0.01 per share (the "Preferred Stock"), of Telos Corporation, a Maryland corporation (the "Issuer"), and is being filed with the Securities and Exchange Commission (the "SEC") pursuant to Rule 13d-1 under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). The principal offices of the Issuer are located at 19886 Ashburn Road, Ashburn, Virginia 20147-2358. ITEM 2. IDENTITY AND BACKGROUND (a) This Statement is being filed by Grand Slam Capital Master Fund, Ltd., a Cayman Islands exempted company ("Master Fund"). Master Fund was formed for the purpose of acquiring and managing assets. This Statement is also being filed by Grand Slam Asset Management, LLC, a Delaware limited liability company ("Asset Management", together with Master Fund, the "Reporting Parties), for and on behalf of itself, which serves as the investment advisor of Master Fund. As such, Asset Management may be deemed to control, directly or indirectly, Master Fund and to beneficially own the shares of Preferred Stock being reported on this Statement by Master Fund. (b) The address of the principal offices of Asset Management and the mailing address of Master Fund is 2200 Fletcher Avenue, Fort Lee, New Jersey 07024. The address of the principal offices of Master Fund is c/o Walkers SPV Limited, Walker House, 87 Mary Street, Walker House, George Town, Grand Cayman, KY-9002, Cayman Islands, B.W.I. (c) Attached as Exhibit A is the name of the executive officers and managers of Asset Management and their business addresses and principal occupations. Attached as Exhibit B are the names of the directors of Master Fund, their business addresses and principal occupations. Master Fund has no executive officers. (d) During the last five years, neither of the Reporting Parties nor any person listed on Exhibits A or B has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors). (e) During the last five years, neither of the Reporting Parties nor any person listed on Exhibits A or B has been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating Page 4

activities subject to, federal or state securities laws or finding any violation with respect to such laws. (f) The nationality of the executive officers and managers of Asset Management are set forth on Exhibit A. The nationality of the directors of Master Fund are set forth on Exhibit B. ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION The funds for the purchase of the shares of Preferred Stock set forth on Exhibit C hereto (the "Shares") have come from the working capital of Master Fund. The aggregate amount of funds used in making the purchases of the Shares in the sixty days prior to the date upon which the Reporting Parties reporting requirement arose is $1,979,869.01. ITEM 4. PURPOSE OF TRANSACTION The Reporting Parties have acquired the Shares, as described in this Statement, in order to obtain a substantial equity position in the Issuer based on the Reporting Parties' belief that the Preferred Stock at current market prices is undervalued and represent an attractive investment opportunity. Depending upon overall market conditions, other investment opportunities available to the Reporting Parties, and the availability of shares of Preferred Stock at prices that would make the purchase of additional shares desirable, the Reporting Parties may endeavor to increase their position in the Issuer through, among other things, the purchase of shares of Preferred Stock on the open market or in private transactions or otherwise, on such terms and at such times as the Reporting Parties may deem advisable. Asset Management anticipates that, from time to time, it may communicate with the Issuer regarding its business and strategic opportunities and identify to the Issuer strategic opportunities and alternatives to be considered by the Issuer. Asset Management may also propose, propose to arrange, or identify to the Issuer sources of capital. Other than as set forth herein, neither of the Reporting Parties, nor any of the individuals set forth on Exhibits A or B has any plans or proposals that relate to or would result in any of the following: (a) The acquisition of additional securities of the Issuer, or the disposition of securities of the Issuer; (b) An extraordinary corporate transaction, such as a merger, reorganization or liquidation, involving the Issuer; (c) A sale or transfer of a material amount of assets of the Issuer; Page 5

(d) Any change in the present board of directors or management of the Issuer, including any plans or proposals to change the number or term of directors or to fill any existing vacancies on the board; (e) Any material change in the present capitalization or dividend policy of the Issuer; (f) Any other material change in the Issuer's business or corporate structure; (g) Any other material changes in the Issuer's charter, by-laws or instruments corresponding thereto or other actions which may impede the acquisition of control of the Issuer by any person; (h) Causing a class of securities of the Issuer to be delisted from a national securities exchange or ceasing to be authorized to be quoted on an inter-dealer quotation system of a registered national securities association; (i) A class of equity securities of the Issuer becoming eligible for termination of registration pursuant to Section 12(g)(4) of the Exchange Act; or (j) Any action similar to those enumerated above. ITEM 5. INTEREST IN SECURITIES OF THE ISSUER (a) The Reporting Parties beneficially own an aggregate of Shares representing approximately 5.16% of the issued and outstanding shares of Preferred Stock of the Issuer. The percentage ownership of the Reporting Parties in the Issuer's capital stock is based on 3,185,586 issued and outstanding shares of the Preferred Stock as reported by the Issuer in its Quarterly Report on Form 10-Q for the quarter ended September 30, 2006, filed with the SEC. The managers of Asset Management do not beneficially own any shares of Preferred Stock. Since Asset Management may be deemed to control, directly or indirectly, Master Fund, Asset Management may be deemed to have the power to direct the vote or disposition of the Shares, and accordingly, may be deemed, for purposes of determining beneficial ownership pursuant to Rule 13d-3 under the Exchange Act, to beneficially own the Shares held by Master Fund. (b) Master Fund directly owns the Shares and has the power to vote or direct the vote and to dispose or direct the disposition of the Shares. Asset Management may be deemed to control, directly or indirectly, Master Fund, Asset Management may be deemed to have shared power to vote or direct the vote and dispose or direct the disposition of the Shares and may be deemed, for purposes of determining beneficial ownership pursuant to Rule 13d-3 under the Exchange Act, to beneficially own the shares of Preferred Stock held by Master Fund. (c) The dates and amount of each acquisition of the Shares is listed on Exhibit C hereto. Except as set forth in Exhibit C hereto, there have been no transactions in shares of Page 6

Preferred Stock since the date of the filing of this Statement by the Reporting Parties or any person or entity listed on Exhibits A or B hereto. (d) No person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the Shares owned by Master Fund except Asset Management. (e) Not applicable. ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO SECURITIES OF THE ISSUER Asset Management provides investment management services to Master Fund pursuant to that certain Amended and Restated Investment Management Agreement, dated September 1, 2003, by and among Asset Management, Master Fund and Grand Slam Capital Offshore Fund, Ltd. Page 7

ITEM 7. MATERIAL TO BE FILED AS EXHIBITS The following materials are filed as Exhibits to the Statement: EXHIBIT A: Information with respect to the executive officers and managers of Grand Slam Asset Management, LLC. EXHIBIT B: Information with respect to the directors of Grand Slam Capital Master Fund, Ltd. EXHIBIT C: As described in Item 3. EXHIBIT D: Joint Filing Agreement. Page 8

SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this Statement is true, complete and correct. Dated: February 14, 2007 Grand Slam Capital Master Fund, Ltd. By: /s/ Mitchell Sacks --------------------------------------- Name: Mitchell Sacks Title: Director Dated: February 14, 2007 Grand Slam Asset Management, LLC By: /s/ Mitchell Sacks --------------------------------------- Name: Mitchell Sacks Title: Member Page 9

EXHIBIT A INFORMATION WITH RESPECT TO THE EXECUTIVE OFFICERS AND MANAGERS OF GRAND SLAM ASSET MANAGEMENT, LLC NAME AND ADDRESS POSITION WITH GRAND SLAM PRINCIPAL OCCUPATION CITIZENSHIP ASSET MANAGEMENT, LLC Mitchell Sacks(1) Member, Managing Member, Managing Grand Slam Asset USA Chief Executive Officer and Management, LLC and Grand Portfolio Manager Slam General Partners, LLC Erik Volfing(1) Member, Chief Financial Managing Grand Slam Asset Denmark Officer and Portfolio Manager Management, LLC and Grand Slam General Partners, LLC Michael Legg(1) Member, Chief Compliance Managing Grand Slam Asset USA Officer and Portfolio Manager Management, LLC and Grand Slam General Partners, LLC 1. The business address of each of the named individuals is c/o Grand Slam General Partners, LLC, 2200 Fletcher Avenue, Fort Lee, New Jersey 07024. Page 10

EXHIBIT B INFORMATION WITH RESPECT TO DIRECTORS OF GRAND SLAM CAPITAL MASTER FUND, LTD. NAME AND ADDRESS POSITION WITH GRAND SLAM PRINCIPAL OCCUPATION CITIZENSHIP CAPITAL MASTER, LTD. Mitchell Sacks(1) Director Managing Grand Slam Asset USA Management, LLC and Grand Slam General Partners Martin Lang(2) Director Employed by International Cayman Islands Management Services Ian Goodall(2) Director Employed by International Cayman Islands Management Services 1. The business address of Mitchell Sacks is c/o Grand Slam General Partners, LLC, 2200 Fletcher Avenue, Fort Lee, New Jersey 07024. 2. The business address of the named individuals is c/o International Management Services Limited, 4th Floor, Harbour Centre, George Town, Cayman Islands. Page 11

EXHIBIT C SCHEDULE OF TRANSACTIONS BY GRAND SLAM MASTER FUND, LTD. DATE OF PUCHASE NUMBER OF SHARES OF PRICE PER SHARE PREFERRED STOCK ($) PURCHASED ================================================================================ 12/06/2005 50,000 10.04 12/07/2005 37,000 10.29 12/13/2005 7,750 10.53 12/14/2005 15,614 10.55 12/15/2005 9,000 10.60 12/28/2005 1,000 12.51 12/29/2005 2,200 12.29 01/31/2006 1,000 13.41 03/30/2006 6,745 13.76 03/31/2006 1,650 14.79 04/10/2006 1,000 15.06 05/31/2006 600 18.00 06/13/2006 1,450 16.92 06/30/2006 3,000 17.80 07/12/2006 800 18.06 07/25/2006 400 18.43 07/31/2006 200 19.00 08/29/2006 200 19.08 08/31/2006 200 18.78 09/13/2006 600 18.55 10/20/2006 200 19.08 12/05/2006 1,300 18.26 12/07/2006 2,100 18.72 12/08/2006 268 18.91 12/12/2006 300 19.26 12/14/2006 2,200 19.09 12/29/2006 1,100 19.92 01/16/2007 1,200 18.02 01/18/2007 200 18.56 01/23/2007 2,600 18.31 01/24/2007 200 18.41 01/24/2007 1,800 18.36 Page 12

DATE OF PUCHASE NUMBER OF SHARES OF PRICE PER SHARE PREFERRED STOCK ($) PURCHASED ================================================================================ 01/25/2007 200 18.56 01/26/2007 500 18.53 01/31/2007 1,600 18.15 02/07/2007 8,000 17.30 02/07/2007 300 17.89 - -------------------------------------------------------------------------------- Total 164,477 1,979,869.01 Page 13

EXHIBIT D JOINT FILING AGREEMENT The undersigned agree that they are filing jointly pursuant to Rule 13d-1(k)(1) of the Securities Exchange Act of 1934, the statement dated February 13, 2007 containing the information required by Schedule 13D, relating to the preferred stock of Telos Corporation, on behalf of the undersigned. Dated: February 14, 2007 Grand Slam Capital Master Fund, Ltd. By: /s/ Mitchell Sacks --------------------------------------- Name: Mitchell Sacks Title: Director Dated: February 14, 2007 Grand Slam Asset Management, LLC By: /s/ Mitchell Sacks --------------------------------------- Name: Mitchell Sacks Title: Member Page 14