A research institute has a concern with the reliability requirements of a military vehicle. Reliability is the probability that a system will accomplish its designated mission in a satisfactory manner or in more specific terms, the probability that it will perform in a satisfactory manner for a given period when used under specified operating conditions. Reliability of a weapon system is often expressed in terms of mean time between failure (MTBF). Two military vehicles were tested to obtain reliability life data for reliability evaluation. The objective of this case is to introduce reliability concept, MTBF, life data analysis and objective procedure for a decision making.