From a press release:
Help eliminate auto theft in and around Manassas – protect your own vehicles from being stolen by taking advantage of MCPD’s free VIN etching service next Saturday, June 9, 2018. The event, sponsored by the Manassas City Police Department, the Prince William County Police Department, and the Virginia State Police H.E.A.T. Program, is provided as a free service to all motorists, weather permitting.