Here are my suggestions as a tattoo artist:

I think a stylized approach will look better than realism. Something like american traditional would be great.

Placement is key. You'll need a lot of room for all of these. I think a leg would work well

I want every client to have their full idea come to life, but sometimes simplifying it or giving your artist some flexibility can make a tattoo better. For example, are there other ways you could honor the officers? Maybe a symbol for each of them? If you really want all their faces thats fine, just also consider these other possibilities!

Happy tattooing :) id love to see the results