The equipment that the military uses on a daily basis must be of the highest quality and reliability. Failure in the field of any apparatus could mean the difference between life and death.
For this reason, the U.S. Defence Logistics Agency (DLA) maintains a list of pre-qualified manufacturers and distributors whose quality control and applied process programs meet or exceed their specific criteria.
This list is known as the Qualified Suppliers List (QSL).
There is a QSL for manufacturers (QSLM) and one for distributors (QSLD).