What it is
A recommendation, not an obligation
STANREC 4790 is a NATO Standardization Recommendation (STANREC), a different instrument from a STANAG. Where a STANAG asks nations to ratify an agreement and then implement it domestically, a STANREC only ever recommends. The document itself states plainly that it "is a non-binding document employed on a voluntary basis and does not require commitment of the nations to implement the standards which are listed in it." Nobody is obliged to do anything because STANREC 4790 exists.
What it points to
The one substantive thing STANREC 4790 does is name a publication: it recommends that nations use AEP-72, Volume V, Edition A. AEP-72 is an Allied Engineering Publication issued in several volumes, each covering a different category of CBRN hazard, and Volume V is the one this STANREC addresses. This page is about the recommendation, not about AEP-72 Volume V's technical content, which sits in that publication and is out of scope here.
The stated purpose is design guidance: "protective equipment and procedures for NATO forces should be designed to allow unaffected operations." In other words, this is an input to designing equipment and writing operating procedures, not an operational risk-assessment tool.
Who acts on it, and when
STANREC 4790 addresses NATO nations and NATO bodies, not a supplier directly. It becomes relevant to industry only at one remove: a nation, or a contract that follows national practice, has to separately call up AEP-72 Volume V before a designer or a supplier has anything to work to. Watching for that reference in a tender or a specification is the trigger, not the existence of this recommendation. "Nations and NATO bodies may propose changes, at any time, through a standardization proposal to the tasking authority," which is the mechanism by which nations, not suppliers, keep it current.
Because the underlying work is about how protective equipment "should be designed," the point in a project's life where it matters is design, well before acceptance testing. Retrofitting protective performance into equipment that is already built costs far more than designing for it from the outset.
The family it sits in
STANREC 4790 is one of several sibling recommendations built the same way, each pointing at a different volume of AEP-72: STANREC 4741 covers the chemical-agent volume, STANREC 4742 the toxic-industrial-chemicals volume, and STANREC 4743 the biological-warfare-agent volume. A related recommendation, STANREC 4730, covers capability and systems requirements for detection, identification and monitoring equipment rather than design challenge levels.
The wider family of CBRN protective-equipment documents it sits alongside includes STANREC 4548 and AEP-38 on protective clothing, STANREC 4725 and AEP-71 on respirator testing, STANREC 4727 and AEP-73 on protective masks, STANREC 4634 and AEP-54 on collective protection, and STANAG 4653 with AEP-58 on decontamination equipment. STANAG 4521 and AEP-07 cover CBRN contamination survivability in equipment design and acceptance more broadly, and STANAG 2521, STANAG 2522 and ATP-3.8.1 cover CBRN defence on operations. STANAG 2103 with ATP-45 covers CBRN warning, reporting and hazard prediction, and STANAG 2553 covers NATO's planning guide for CBRN casualty estimation. None of these is a requirement of STANREC 4790 itself; they are the neighbouring documents in the same programme.
Governance and currency
STANREC 4790 is Edition 1, promulgated 20 September 2017, and "does not supersede any document." It sits within NATO's CNAD, AC/225 NAAG and JCBRND-CDG structure, and is reviewed at least once every three years, with any nation or NATO body free to propose a change to the tasking authority at any time.