I carry this every day while on foot going to work ( http://www.511tactical.com/covrt-m4.html )
with rifle and couple mags. To avoid blue on blue incident my reaction is to throw my raid jacket on as it's gotta be one of the most recognizable law enforcement pieces of clothing on the planet, then throw my badge around my neck and last would be to throw that magazine carrier on to my belt.
Anyway, that's the idea.