the city of detroit should wall off a vast abandoned area of the city with abandoned industrial and resident buildings. they should then turn it into simulation training centre. police swat teams could use it for tactical training, federal agencies and police departments from around the country could use it. also the military could use it. it could also be use to run simulations for other emergency services, fire, rescue etc. even military could use it to do urban warfare training. they could also rent it to private groups for air soft and paintball tournaments. it could even be leased as a film set. the city could make money from this while providing a useful service and reducing crime.
Australia