What it is
STANAG 6506 is the NATO Standardization Agreement by which participating nations commit to implement AMedP-9.1, Edition A, "Modular approach for multinational medical treatment facilities (MTF)". This is Edition 1, promulgated 9 November 2018, and the document states plainly that it "does not supersede any document."
A STANAG is not the treatment facility structure itself
A STANAG is the agreement by which NATO nations commit to implement a standard, not the technical content itself. STANAG 6506's own text is short and administrative: an aim, an interoperability requirement, and the ratification, implementation and review machinery. "Participating nations agree to implement the following standard": AMedP-9.1, Edition A. The modular facility structure itself, what a treatment facility module actually consists of and how it is staffed, lives in that publication, not in this cover agreement.
What it commits nations to
The stated interoperability requirement is "to enable groups of nations to pool and share national medical capabilities and create multinational treatment facilities, based on a modular approach, either as contingent capabilities held at readiness or for deployment on operations." The document notes this grew out of the Smart Defence Project Tier 1.15, on pooling and sharing multinational medical treatment facilities. The cover names other related NATO documents alongside AMedP-9.1: STANAG 2228 (Allied joint doctrine for medical support, and AJP-4.10), STANAG 2560 (evaluation of NATO medical treatment facilities, covering AMedP-1.6, AMedP-1.7 and AMedP-1.8), STANAG 2552 (guidelines for a multinational medical unit, covering AMedP-9.2), and STANAG 2249 (training requirements for health care personnel in international missions, covering AMedP-8.3).
Who it binds, and how
STANAG 6506 binds nations and NATO bodies, not suppliers or contractors directly; the word "contract" does not appear in its own text. It becomes binding on a nation through ratification: the Letter of Promulgation states the agreement "has been ratified by member nations, as reflected in the NATO Standardization Document Database (NSDD)", and it "is effective upon receipt and ready to be used by the implementing nations and NATO bodies." Partner nations are separately invited to adopt it. Nations are "invited to examine their ratification of the STANAG and, if they have not already done so, advise the NSO of their intention regarding its implementation," and once implemented, are "invited to report on their effective implementation of the STANAG in accordance with AAP-03." Partner nations are asked to report their adoption the same way.
How it's evaluated
STANAG 6506 describes no certification scheme and no audit; the document never uses the word "certified" or "certification". What it describes is nations reporting their ratification and implementation status to NATO for the record. Where a multinational medical treatment facility itself gets evaluated in practice, the cover names STANAG 2560, evaluation of NATO medical treatment facilities, as the related document for that, not this agreement.
Standards it references
STANAG 6506 covers AMedP-9.1, the publication that carries the actual modular treatment facility structure. Its "Other Related Documents" also name STANAG 2228 (covering AJP-4.10), STANAG 2560 (covering AMedP-1.6, AMedP-1.7 and AMedP-1.8), STANAG 2552 (covering AMedP-9.2), and STANAG 2249 (covering AMedP-8.3), all of which inform rather than bind through this agreement. Reviews of STANAG 6506 itself run under AAP-03.