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A dynamically reducing retransmission control scheme is proposed for slow-frequency-hopped communication systems. In the proposed scheme a transmitter defers transmission of a new packet until all the other transmitters receive positive acknowledgments, so that the number of active transmitters are dynamically reduced. The performance of the proposed scheme is compared with the conventional scheme, in which a transmitter is permitted to transmit a new packet in any slot, in terms of the normalized throughput and the 98% packet transmission delay. The numerical results show that the proposed scheme outperforms the conventional scheme, although for some values of the number of transmitters the conventional scheme has higher normalized throughput.