I would say that the CIWS-1 knife is the basic close combat weapon designed for the first TSF the F-4 Phantom. The CIWS-2A melee halberd was an optional weapon requested for by Japan and build based on their design during their request for their batch of F-4s which they did not really received until quite late, so its more of a one off release. When other countries started to design their own customized TSFs for use in their area of operations, they designed their own melee halberds as well. So only the US does not have melee halberds, since they reply on quick strike doctrine which has minimal close range BETA combat.
As a note, the Vanguard positions seem to be a UN terminology, and might not be used across all armies.
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When in deadly danger, when beset by doubt. Run in little circles, wave your arms and shout.
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