The first question I usually get is, "I am a cop now, so what can I carry?" Then I always retort with the same answer: "Whatever your departmental rules and regulations allow you to carry." That took all the fun out, didn't it? Some agencies have regulations on make, size, caliber, carry fashion, having it registered, and familiarization. So, after you check into these items, most of the basic questions are answered by now.
What concerns me here now is the tactics part. I have known officers that have "the holster du jour" and a gun for every day of the week. This is wasteful and tactically unsound. My recommendation is to have a weapon you are thoroughly familiar with and a sound carry system. I do not want you at the moment of truth hesitating and trying to recall just what weapon and carry rig you have on today. Get a good one and stick to it for now. Basics count.
Now, what else can you think of that you should carry? How about your proper credentials? Your shield or star and updated identification card are a must! You are not Paladin from the old television series of 'Have gun will travel'. Should you ever get into a situation, having the proper credentials may save you from an embarrassing situation with the locals.
Other Accoutrements of Life
Going out on the town with the idealism of self-defense is one thing, but preparation is another. There are a few other accoutrements that I consider worthy of consideration.