The Strategic Defense Initiative (SDI) mid-course tracking problem is a very computationally intensive problem that must be solved in real time.It is generally believed that a real-time solution is only possible through massively parallel computing.This paper discusses tti implementation of the TRC code, a mid-course tracking code, on a 1024 processor nCUBEYten computez A brief discussion of the modeling approach used in the TRC is provided together with a discussion of how the ZRC was restructured to make it run e~iently in parallel.The penjormance of the parallel version of the TRC over a wide range of problem sizes is discussed and results obtained on a Cray X-MP single processor are compared to the nCUBE/ten results.These results demonstrate the applicability of massively parallel MIMD computing to the SDI mid-course tracking problem.1.0