The elements of TCP/IP are scalability, flexibility, and openness which can be used by different users in any environment. TCP reliability in Military in connection performance is required by the SMTP in Military application so that the email sent wouldn't get lost and it makes SMTP in Military easier in performing the job in view of the fact that SMTP in Military don't have to provide reliability in the application code. Communication that occurs between the server and the client are done by some commands which can be understood easily. (Tanenbaum, 1996)