[General Audience version]
Full/Nude version here
KRPD Officer Sykran, call sign 'Nytro'
Now here's a face you might know. My main character Nytro, the strongheaded, smirky, charming jerk; an undercover officer for the Kan Rein Protection and Defense [KRPD]. The metropolis of Kan Rein City, capital of the homeworld Serko, has a unified police and military force. They are both soliders and cops, yet neither; the duties cover both.
He is part of a mobile, versatile unit in which call signs are based on the elements. My world has 255 elements, but some remain the same as ours, Ark's being, of course, nitrogen, and adapted to "Nytro."