Defense Industries Served Defense A.T. Wall supplies tubing manufactured to applicable military specifications, backed by MIL-Spec quality systems and full traceability. Why Defense Customers Buy From A.T. Wall Waveguide tubing manufactured to applicable military specifications MIL-Spec quality systems — DFARS and ITAR compliant 100% USA manufactured Full material traceability and Certificate of Compliance with every shipment Decades of experience supplying mission-critical components Have a challenging tubing application? Talk to Our Engineering Team →