What it is
A recommendation, not an obligation
STANREC 4755 is a NATO Standardization Recommendation on life cycle costs. As with every STANREC, the distinction that matters most is in its name: unlike a STANAG, it does not commit a nation to ratify anything. The document's own Implementation clause 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 these five pages creates a duty for a supplier to sign up to directly.
What it recommends
The entire substantive content of STANREC 4755 is one line: "The following standard is recommended: ALCCP-01, Edition B." The stated aim is "to list recommended practices regarding: the life cycle costs," but the document does not itself describe those practices, define life cycle costs, or set out a methodology - it names the one document that does, and stops there. Anyone who needs the actual cost-estimation content has to read ALCCP-01 itself, not this covering recommendation.
Other related documents
The text separately names, without saying this recommendation depends on them, STANAG 4728 (System Life Cycle Management) alongside AAP-20 and AAP-48, and STANREC 4808 (Engineering in NATO Programmes) alongside AEP-67 and ALP-10. These are adjacent reading in the same family of life cycle and quality documents, not content this STANREC binds anyone to.
Edition 2, and what it replaced
This is Edition 2, promulgated 23 May 2018. The text states that it supersedes an earlier edition of STANREC 4755, without giving that edition's own number or date, so they are not repeated here.
Review, and who can raise a change
STANREC 4755 "is to be reviewed at least once every three years," with "the result of the review... recorded within the NSDD." Outside that cycle, "Nations and NATO bodies may propose changes, at any time, through a standardization proposal to the tasking authority (TA)," to be processed at the next review. The recommendation is supervised under the CNAD Life Cycle Management Group (AC/327), with Germany named as custodian.