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Also, not all successive deployed machines have to have chronological numbering attached to them.
Intermittent projects which had be designated ARX-5 or something else, may never have progressed beyond the design phase and remained paper concepts, while the designs were being overtaken by newer concepts and configurations proceding under a different designation.
To my knowledge the X in ARX means experimental, with AR standing for Advanced/Armslave Research perhaps?
The ARX models that do not carry the standard M (Military) code that series produced armslaves have.
As such, they're much like the X-planes in the US military designation system.
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