The United Kingdom was the first to develop and introduce a tracer round, a version of the .303 cartridge in 1915.[2] The United States introduced a .30-06 tracer in 1917.[3] Prior to adopting red (and later, other color) bullet tips for tracers, American tracers were identified by blackened cartridge cases.Originariamente Scritto da Decay
Da wikipedia
1915. Spero sappiate l'uso del 303 e del 30.06
Edit. Another use for the tracer is in tank hull machineguns, of mostly out-dated tanks, where the machinegun operator cannot sight directly along the barrel, thus they have to rely on tracer bullets to guide their aim
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