What it is
STANAG 2542 is a NATO Standardization Agreement, currently Edition 2, dated 17 September 2018. It is not a technical specification. It is the agreement by which NATO nations commit to implement AJMedP-1, Edition A, the Allied Joint Medical Planning Doctrine. The doctrine itself, not this cover, is where the substance lives: the interoperability requirement stated in the STANAG is "improved coordination and cooperation among NATO nations and operational partners in the domain of medical support to Allied operations by adjusting the introduced medical planning procedures to the current operational-level planning publications." Read on its own, STANAG 2542 requires almost nothing of a supplier directly. Its obligations run to nations, and it reaches an organisation supporting a medical support operation only once a nation has implemented it and a specific tasking or contract invokes the doctrine.
Who it binds, and how
STANAG 2542 is explicit that it binds nations rather than organisations. Its letter of promulgation describes the enclosed agreement as one "which has been ratified by member nations, as reflected in the NATO Standardization Document Database (NSDD), is promulgated herewith." Under "Agreement," participating nations agree to implement the standard named: AJMedP-1, Edition A. Implementation is a national act, discharged "when the necessary orders/instructions have been issued directing the forces concerned to put the content of this agreement into effect" - not a duty a supplier signs up to by reading this document. Ratification and implementation are separate steps, and the document invites nations that have not yet reported their position to "advise the NSO of their intention regarding its implementation." So "is STANAG 2542 mandatory" has no single answer: it depends on whether a given nation has ratified and implemented it, and, for an organisation supporting a medical support operation, on whether a specific tasking or contract then invokes the doctrine that implementation puts in place.
What the agreement actually commits nations to
The stated aim is to respond to an interoperability requirement: "improved coordination and cooperation among NATO nations and operational partners in the domain of medical support to Allied operations by adjusting the introduced medical planning procedures to the current operational-level planning publications." The STANAG states it "is effective upon receipt and ready to be used by the implementing nations and NATO bodies" - a NATO-wide mechanism, not a national or civil one. None of this is written as a duty on a supplier; it is a duty on the nation, and on the NATO and national bodies that plan and coordinate medical support to an operation.
A cover agreement, not the doctrine itself
A reader who only has STANAG 2542 in hand does not yet have the doctrine it points to. The actual planning doctrine - how medical support to an operation is planned and coordinated - sits in AJMedP-1, Edition A. Other related documents named alongside it are MC 0326/3, NATO's principles and policies of medical support, and STANAG 2228, which covers AJP-4.10, the allied joint doctrine for medical support.
Reporting and review
National decisions on ratification and implementation are provided to the NSO and recorded in the NSDD. Nations are invited to report their effective implementation, and partner nations their adoption, in accordance with AAP-03. The STANAG itself "is to be reviewed at least once every five years," with the result recorded in the NSDD - a check on whether the agreement is still current, not an audit of any organisation. Nations and NATO bodies may propose changes at any time through a standardization proposal to the tasking authority. The agreement is supervised under the authority of the Military Committee Medical Standardization Board (MCMedSB) and the Military Medical Structures, Operations working group (MMSOP), with Canada's representative to MMSOP named as custodian.
What it does not cover
STANAG 2542 names no medical planning procedure, staffing requirement or clinical detail of its own - that content sits entirely in AJMedP-1. It also names no assessment or certification scheme: the only stated check is that the STANAG itself is reviewed periodically, not that an organisation is certified.