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Having no knowledge of the expression “Zulu,” I looked it up and learned two interesting things.
The Zulu Kingdom was very powerful in South Africa until Great Britain made some changes.
Zulu time is kind of a “folk” expression meaning UTC, Universal Time, but is used mostly by the US military to distinguish from local times, time zones, daylight time and all those mixups.
Cannot find a reason for using the expression Zulu as a time reference.