https://www.merriam-webster.com/grammar/fewer-vs-less
Essentially, fewer is normally used for discrete numbers of things (e.g. “fewer apples”, “fewer boats”, or “fewer cops”) while less is used for amounts (e.g. “less water”, “less sand”, or “less money”).
As noted in the above link, there are exceptions. However, the exceptions listed are all with “than” or “or” added. Specifically, it’s pointing put that while “fewer items” is correct, “3 items or less” is also considered correct.
In the case of the sign, it is referring to the specific number of officers in the city, so it should use “fewer”. Does it matter? No, not really. Why did I bother saying anything? I got a chance to rep grammar and quote Stannis Baratheon at the same time.
Contrary to my usual tendencies, I was not a patient gamer with Survivor. I got it on PS5 the week it released, if I remember correctly. The performance issues were surprising (although actually still better on release than Fallen Order was), but other than that the game was an improvement for me in every way. Once a few patches came out improving stability, it completely superseded the original.
Edit: And I’m glad to hear it runs well enough on PC now; once I upgrade my GPU I may watch for a sale and double dip.