What it is
The agreement, not the specification
STANAG 2178 is a NATO standardization agreement, not a technical specification. NATO nations use a STANAG to record a shared commitment, and the technical content it covers usually lives in the Allied Publication the STANAG names. Here, "Participating nations agree to implement the following standard": AMedP-1.15, Edition A, the Allied Medical Publication on compatible medical tubing and connectors. STANAG 2178 explains how that commitment came about and how it is ratified and reported. For what the connectors actually have to do, the substance sits in AMedP-1.15, not here.
What nations commit to
The agreement responds to an interoperability requirement: to standardize "the shape and dimensions of connectors and fittings, in tubes and catheters for medical application used in the treatment and the transport of casualties by medical teams of NATO Armed Forces." STANAG 2178 does not set out those dimensions itself. It commits ratifying nations to the publication that does, and stops there.
Ratification is a national decision, not an automatic obligation
Ratifying a STANAG is a national decision, recorded in the NATO Standardization Document Database, and a nation can ratify with reservations the way any STANAG ratification can. Ratifying STANAG 2178 does not by itself bind a supplier. It is implemented "when the necessary orders/instructions haven been issued directing the forces concerned to put the content of the covered standard into effect", and it reaches an organisation supplying tubing or connectors when a contract or tender for a NATO or national armed force invokes AMedP-1.15, not automatically because the STANAG has been ratified.
Reporting and review
Nations report their effective implementation on the form at Annex H to AAP-03; partner nations report their adoption on the form at Annex G to the same publication. The STANAG is reviewed at least once every three years, with the result recorded in the NSDD, and a nation or NATO body can propose a change at any time through the tasking authority.
Edition and governance
This is Edition 2, dated 1 February 2016, and it supersedes STANAG 2178 Edition 1. The tasking authority is the Military Committee Medical Standardization Board, through the Medical Standardization Working Group; the custodian nation is Spain, through its Medical Material and Military Pharmacy Expert Panel. The document names no other related document.