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Ten of these were produced for the US Navy between 1985 and 1986. Whilst some of these were being dived by amateur divers until about the late 1990's, I think its ttrue to say that due to uncertainties around oxygen cell sourcing as well as the analog elecs in general, most divers were transitioning to alternative rebreathers or the MK15.5.
Some pictures are shown below and further details will follow:
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