Reliability is one of the main salient assets of modern weapon systems. The estimation of the failure rate of the major subsystems of military defence systems is of utmost importance in the design of any country\'s overall defence system. The results of a study to estimate the failure rate of the main computer system of the launcher of a shore to sea missile launcher is presented in this study. The effect of this failure rate on the reliability of the launcher and the overall availability of the missile guidance, launch and control system are studied considering the vast region to be covered along the Persian Gulf and the Oman Sea area by such a defence system. Since aging of parts reduces a system\'s availability, the availability of the coastal missile defence system is studied based on the availability of each subsystem indicating the extent of work required for the reliability growth of the missile defence system along the coast.

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