While STANAG 4157 is the "covering" agreement, the actual nitty-gritty test procedures are often found in Allied Ordnance Publication 20 (AOP-20) . Why Interoperability Matters

Some public documents are freely downloadable, but STANAGs are often export-controlled. You may need to create a registered account. For contractors, using your .mil or corporate defense email is recommended.

Its primary purpose is to provide a standardized list of acronyms and abbreviations to ensure clear communication and interoperability among NATO member nations. It serves as the companion document to STANAG 1059 (NATO Glossary of Country Codes) and AAP-15 (NATO Glossary of Terms and Definitions).