The U.S. Army Corps of Engineers Sacramento District recently partnered with the Calaveras County Sheriff’s Department, Army CID, Army Counterintelligence and USACE South Pacific Division Security and Law Enforcement for Iron Walls 2025 – a three-day, full-scale antiterrorism exercise from Aug. 7-11. From bomb threat response to force protection coordination, this training brought together federal and local partners to strengthen readiness and cooperation.