Now, for my non-LEO readers, call signs are the identifiers used by each of the units. It's what we call for on the radio when we send them to calls, what they use to tell us who's talking. Some units (like specialty-type units) have permanent call-signs, but for the most part, patrol guys are either assigned or pick their beats - thus their coinciding call sign - at the beginning of the shift in briefing. So if you like switching it up and working different beats, or are low on seniority, your call sign can change every day. And in this job, the days end up just running all together. It can be hard to remember what day it is.
So Officer Forgetful is working a line beat one day, and keeps identifying himself incorrectly. The first couple times, he catches himself and corrects. But then he gets a hot call, and that just goes out the window. He's every call sign that we have with each new transmission. Like I said, we are friends, so I know his voice pretty well. Every time he identifies incorrectly, I copy him back with his correct call sign, hoping that he'll pick up on the subtle reminder... but he doesn't.
After everything calms down, I send him a message to his MDC (the computer in their patrol vehicles), telling him that he keeps ID'ing wrong, and it's making my job tougher, so if he could kindly knock it off, I'd appreciate it. He sends back his apologies (which was very nice), and says that he won't do it again.
The next day, he goes on a stop with a habitual in a notoriously bad radio spot, and stops answering radio traffic. We call his cell, and no answer. So we drop a tone, and ask his status again. Nothing. So we roll beat partners his way, get the sergeant notified, et cetera et cetera. Air on a clearance until we hear a "Code 4" from him. He calls in to the person who was calling and texting his cell, with a simple "Hey - what's up? So who is the tone for? What do they have?"
He did it again. He forgot his call sign. He heard dispatch the whole time, he just thought the tone and calvary were all for someone else not answering.
For his exact location. His exact 10-20!
The next time he came into the communications center, I gave him a sharpie and told him that he should start writing his beat assignments on his hand so he can remember who he is.