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This paper characterizes the performance of a hybrid automatic repeat request protocol developed for use in EHF SATCOM on the move systems. The protocol consists of Reed-Solomon coding for random error correction and a selective repeat ARQ scheme for blockage mitigation. The implementation is highly configurable and includes support for features such as variable rate FEC coding, arbitrary packet lengths, framing etc. Performance results, including throughput efficiency and latency, as a function of channel conditions and protocol parameters are given.