EXHIBIT 4.49 [Markland Technologies letterhead] March 17, 2005 DKR Soundshore Oasis Holding Fund, Ltd. Global Equity Finance Citigroup Global Markets, Inc. 390 Greenwhich Street, 5th Floor New York, NY 10013 Dear Michael S. Collins: Subject to the conditions and limitations of Markland Technologies, Inc. Secured Convertible Note, Due September 21, 2005, Markland Technologies Inc., has elected to pay accrued interest by Issuing Shares of Common Stock. This election will be in effect until further notice. If you have any questions, you may contact me at 203-894-9700 ext. 104 Sincerely, /s/ Ken Ducey, Jr. Ken Ducey, Jr. President [Markland Technologies letterhead] March 17, 2005 DKR Soundshore Oasis Holding Fund, Ltd. Global Equity Finance Citigroup Global Markets, Inc. 390 Greenwhich Street, 5th Floor New York, NY 10013 Dear Michael S. Collins: Subject to the conditions and limitations of Markland Technologies, Inc. Secured Convertible Note, Due September 21, 2005, Markland Technologies Inc., has elected to pay accrued interest by Issuing Shares of Common Stock. This election will be in effect until further notice. If you have any questions, you may contact me at 203-894-9700 ext. 104 Sincerely, /s/ Ken Ducey, Jr. Ken Ducey, Jr. President [Markland Technologies letterhead] March 17, 2005 Harborview Capital Management David Stefansky 850 3rd Avenue, Suite 1801 New York, NY 10022 Dear David Stefansky: Subject to the conditions and limitations of Markland Technologies, Inc. Secured Convertible Note, Due November 9, 2005, Markland Technologies Inc., has elected to pay accrued interest by Issuing Shares of Common Stock. This election will be in effect until further notice. If you have any questions, you may contact me at 203-894-9700 ext. 104 Sincerely, /s/ Ken Ducey, Jr. Ken Ducey, Jr. President [Markland Technologies letterhead] March 17, 2005 Southridge Partners, LP Henry Sargent 90 Grove Street Suite 205 Ridgefield, CT 06877 Dear Henry Sargent: Subject to the conditions and limitations of Markland Technologies, Inc. Secured Convertible Note, Due November 9, 2005, Markland Technologies Inc., has elected to pay accrued interest by Issuing Shares of Common Stock. This election will be in effect until further notice. If you have any questions, you may contact me at 203-894-9700 ext. 104 Sincerely, /s/ Ken Ducey, Jr. Ken Ducey, Jr. President