What it is
A recommendation, not an obligation
STANREC 4777 is a NATO Standardization Recommendation on the architecture for intelligence, surveillance and reconnaissance (ISR) interoperability. The distinction that matters most is in its name: unlike a STANAG, a STANREC does not commit a nation to ratify anything. The document itself is explicit 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." Nothing in it creates a duty for a supplier to sign up to directly.
What it recommends
The document's stated aim is "to list recommended practices regarding" "a top-level architecture which will provide a context and structure for the STANAGs under the purview of the Joint Capability Group on Intelligence, Surveillance, and Reconnaissance and other NATO interoperability initiatives." Its recommendation is a single line: "the following standard is recommended: AEDP-02, Volume I, Edition B". The document names no other related document and does not describe AEDP-02's content itself, only that it is the architecture nations are invited to build ISR interoperability around.
Who oversees it
STANREC 4777 is supervised jointly by the NATO Air Force Armaments Group (NAFAG, AC/224) and the Joint Capability Group on Intelligence, Surveillance and Reconnaissance (JCGISR), with the United States of America named as custodian. It is reviewed "at least once every three years," and nations or NATO bodies may propose changes at any time through the tasking authority, with the result recorded in NATO's Standardization Document Database.
Where the actual requirements live
STANREC 4777 has no clauses of its own to audit against - it is a recommendation, not a specification. Whatever is testable sits inside AEDP-02, Volume I, Edition B, which we hold a record for but have not yet written a page on. The review this document names is of its own currency, not of an organisation or a system built to it.