DFARS Clause 252.225-7014, Preference for Domestic Specialty Metals, Alternative 1, as classified in 225.7002-3 (b)(1). Classification of materials used by Lyn-Tron are:

Steel: is Compliant
Stainless Steel: is Compliant
Brass: is Exempt of this Requirement
Aluminum: is Exempt of this Requirement

Online References

DPAP - The Defense Federal Acquisition Regulation Supplement website

What is DFARS? - Defense Federal Acquisition Regulation Supplement (DFARS) and Procedures, Guidance, and Information (PGI)

DFARS Clause 252.225-7014 - .PDF download