U.S. Navy shipboard communications experts are placing a $12.9 million order with General Dynamics to provide AN/USC-61(C) maritime radios for Navy surface warships and submarines. The Space and Naval Warfare Systems Command (SPAWAR) in San Diego is asking the General Dynamics Mission Systems segment in Scottsdale, Ariz., for the continued production of the AN/USC-61(C) Digital Modular Radio (DMR), initial sparing components, and related supplies and services. The General Dynamics AN/USC-61(C) shipboard radio enables surface ships and submarines to communicate over high frequency (HF), ultra-high frequency (UHF) line of sight, UHF satellite communications (SATCOM), and very high frequency (VHF) radio bands. The compact, multi-channel AN/USC-61(C) operates on Navy surface ships, submarines, and other military platforms using frequencies from 2 MHz to 2 GHz. General Dynamics certified the maritime software-defined radio (SDR) to pass secure voice and data at multiple independent levels of security (MILS) over HF, VHF, UHF, and SATCOM channels and withstand the effects of electromagnetic interference and other harsh operating conditions.