The U.S. Department of State is seeking contractor support for large-scale blast testing and fragmentation characterization of anti-ram perimeter systems under a simulated VBIED attack. The work involves two phases: debris characterization of baseline barriers under a 2,000-lb TNT-equivalent blast, followed by testing of modified systems with opaque claddings. The estimated period of performance is up to 24 months, with accelerated schedules preferred. This is a sources sought notice for market research only, not a solicitation, and no contract will be awarded from this announcement. No budget information or location for performance of services is specified.