Is the SSPK (Single Shot Probability of Kill) sufficient to represent a kill vehicle performance? This question is often asked because the SSPK computation ignores the details of the miss distance performance and considers only the threshold limit of the miss distance. One may intuitively think that a KV (kill vehicle) with a smaller average miss distance should perform better than the one with a larger distance. In this case the SSPK alone may not be sufficient to represent a KV performance. This paper, however, will show that the SSPK and the miss distance performance are related (i.e., a higher SSPK means a smaller average miss distance, and vice versa) and therefore the SSPK is a sufficient KV performance measure. The relationship is derived based on the observation that KV miss distance obeys Rayleigh statistics.