EXHIBIT A JOINT FILING AGREEMENT

EXHIBIT A

JOINT FILING AGREEMENT

The undersigned agree that this Schedule 13D dated October 1, 2009 relating to the common stock, par value $0.0001, of Argyle Security, Inc. shall be filed on behalf of the undersigned.

	MEZZANINE MANAGEMENT FUND IV A, L.P.
	By:	/s/ Xxxxxxxxxxx X. Xxxxxx
		Name:	Xxxxxxxxxxx X. Xxxxxx
		Title:	Authorized Signatory
	MEZZANINE MANAGEMENT FUND IV COINVEST A, L.P.
	By:	/s/ Xxxxxxxxxxx X. Xxxxxx
		Name:	Xxxxxxxxxxx X. Xxxxxx
		Title:	Authorized Signatory
	MEZZANINE MANAGEMENT LIMITED
	By:	/s/ Xxxxxxxxxxx X. Xxxxxx
		Name:	Xxxxxxxxxxx X. Xxxxxx
		Title:	Authorized Signatory

[Additional signatures on the following pages]

XXXXXXX XXXXX MEZZANINE CAPITAL
FUND III, L.P.

By:      Xxxxxxx Xxxxx Mezzanine Capital

            Partners III, L.L.C., its general partner

By:       /s/ Xxxxxxxx X. Xxxxx                           
Name:   Xxxxxxxx X. Xxxxx
Title:     Initial Managing Director

XXXXXXX XXXXX MEZZANINE CAPITAL
PARTNERS III, L.L.C.

By:      /s/ Xxxxxxxx X. Xxxxx                            
Name:  Xxxxxxxx X. Xxxxx
Title:    Initial Managing Director

XXXXXXX XXXXX & COMPANY, L.L.C.

By:      /s/ E. Xxxxx Xxxxxxxx III                        
Name:  E. Xxxxx Xxxxxxxx III
Title:    Principal

WILBLAIRCO ASSOCIATES

By:      /s/ Xxxxx X. XxXxxxxx                           
Name:  Xxxxx X. XxXxxxxx
Title:    Principal

XXXXXXX X. XXXXXXXXX

/s/ Xxxxxxx X. XxxXxxxxx                                    

Xxxxxxx X. XxxXxxxxx

XXXXXXXX X. XXXXX
 
/s/ Xxxxxxxx X. Xxxxx                                           

Xxxxxxxx X. Xxxxx

XXXX X. XXXXXXX
 
/s/ Xxxx X. Xxxxxxx                                               

Xxxx X. Xxxxxxx