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It was mostly dependant to the types of ammunition being fired, what factory was making it, and what compounds were available at the time to put into the rounds (different elements make different colours, like putting a copper tube into a camp fire)
This is called Googling. Very good.
Disrespectful to make such assumption, there is still people around who read books and know stuff.
If you type into google "Green tracers WW2" this is honestly the first thing that comes up. It's copy and paste.
https://www.google.com/search?sxsrf=ACYBGNT73PxB_BN_kG22cCJFYp-KBDS7Xw%3A1575248992206&ei=YGTkXfWWDMzYsAXVqKyYAg&q=german+tracers+ww2&oq=german+tracers+ww2&gs_l=psy-ab.3..0i22i30l3.3333.7668..7953...2.1..0.137.2073.11j9......0....1..gws-wiz.......0i71j35i39j0i67j0i131i273j0i273j0i131j0j0i131i67j0i10j0i20i263j33i160j33i299.ZRoefIyE9Ik&ved=0ahUKEwj1xvPk45XmAhVMLKwKHVUUCyMQ4dUDCAo&uact=5
added proper link for the edits.
"are there aliens and sci-fi involved"
No just millions of loud mouths ignorant of any firearm, ballistics, or historical facts screeching incessantly.