For specific product lines, yes. There's a list of those parts DoD keeps. Anything off that list we have to get either the vendor's guarantee to keep making the

For specific product lines, yes. There's a list of those parts DoD keeps. Anything off that list we have to get either the vendor's guarantee to keep making them or the supplier's attestation that they have N of them on hand. In terms of stability, as others have pointed out all that means is "the vendor won't change it and will keep providing it"