Here is the official thread for the Xenia, Ohio's Thunderbolt Sirens. I first knew Xenia had Thunderbolt's back in 2009 when we were driving on state route 68 through Xenia and I spotted a yellow hornless Thunderbolt next to a restaurant called "Nicks". Sadly, that Thunderbolt has been removed by the restaurant for extra parking space.

All the Thunderbolts are inactive due to being replaced by 2001-SRN-B's in 2003, but most of the Thunderbolts still remain untouched for years. A few photo's can be found below.
First off the Goodwill Thunderbolt (same siren that's in my avatar):
Thunderbolt on Ormsby Drive Near Springhill Park:
Ormsby Thunderbolt's RCM, you can see the early 1970's logo:
Ormsby Thunderbolt and its replacement 2001-SRN-B:
Xenia Community School building Thunderbolt:
Community School building and Thunderbolt:
Community School building replacement 2001-SRN-B:
A map link that my brother made can be found here:
http://goo.gl/maps/lxjkP
Thanks for looking!