This patch is made in honor of the Borderline Shooting in Thousand Oaks, California. "4S3" is the callsign of Sergeant Ron Helus that gave his life to save those inside. "BL12" is in honor of the 12 people that tragically lost their life that night. The patch includes a thin blue line in honor of law enforcement. This patch is designed off of the Ventura County Sheriffs Office patch.