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Many features near the Galactic Center have been called 3-kiloparsec arms. Wereached a point of having too many divergent data, making it difficult to beconstrained by a single physical model. Their differing characteristics suggestdifferent physical and dynamical objects.  Radial velocity data on the so-called 3-kpc arms do not coincide with radialvelocities of major spiral arms near 3kpc, nor near 2 kpc, nor near 4 kpc fromthe Galactic Center (Fig. 1 and 2).  Different 3-kpc arm features may require different models: turbulence arounda shock in a Galactic density wave between 2 and 4 kpc from the Galactic Center(Table 1), or nuclear rotation between 0 and 2 kpc from the Galactic Centerregion (Table 2), or a putative radial expansion between 0 and 4 kpc from theGalactic Center.  Despite their naming as Near 3-kiloparsec arms or Far 3-kiloparsec arms,these features are not major arms. Those 3-kpc arm features nearer the GalacticCenter (within 13o of Galactic longitude) may be different than those fartherout (Table 2).  Here we show that the plethora of observed '3-kpc arm' features can beseparated in two: those with Galactic longitude of 13 degrees or more away fromthe Galactic Center (Table 1 - some of which are possibly associated with theobserved major spiral arms), and those within 13 degrees from the GalacticCenter (Table 2 - some of which are possibly associated with the observedcentral bars; Fig.1 and Fig.2).

On the many '3-kiloparsec arms' - shocked wave and nuclear rotation