Location probably FBI firearms training range in North Chicago, IL
Project 25 Cities - Tactical N653
Tactical channel is equipped with a three site multi-cast 125-watt
conventional (VHF) repeater and 15 voted receivers strategically located to provide on-street portable coverage in the Chicago metropolitan area.
167.5375R N167 active, last time heard active, about a year ago.
Call signs Sierra1 and Sierra2 ground spotters.
Smoke bomb entry.
Aircraft identified as XRAY, berm landing after exercise concluded.
Culprit: Dummy that wouldn't stay upright during exercise. Had to be held in place by hand.