In some examples, a non-incendiary tracer projectile structure for housing an electrically powered illumination source comprises a jacket comprising a generally pointed forward end and a generally blunt rearward end defining a rear opening, an internal retaining structure disposed towards the rearward end of the jacket to support a protective window that is transparent to a selected electromagnetic wavelength, wherein a portion of the rearward end of the jacket tapers in a radially inward direction whereby to define a circumferential narrowing of the rear opening so configured as to mechanically protect the internal retaining structure.
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