This page describes laws and policies covering domestic preference contracting.
DPC policy issuances supporting the OMB waiver review requirements:
As part of this guidance, users are encouraged to take the Defense Acquisition University (DAU) online training, FAC 094 Improving Transparency in the Federal Marketplace: Digital Nonavailability Waivers at https://www.dau.edu/.
Additional information about restrictions on purchasing from non-U.S. sources is available here. https://www.acq.osd.mil/asda/dpc/cp/ic/purchasing-restrictions.html