In what areas would you typically find enriched air cylinders marked with a green or green/yellow band?

Enriched air cylinders are marked with a green or green/yellow band to indicate that they contain a higher percentage of oxygen than normal air, which typically has around 21% oxygen. This marking system is widely recognized and is intended to promote safety by ensuring that divers and dive professionals can easily identify enriched air tanks.

The use of green or green/yellow bands on enriched air cylinders is not limited to any particular region or country; rather, it is a standard that has been adopted internationally. Dive organizations and agencies around the world recognize this color coding to help prevent accidental misuse and to ensure diver safety irrespective of location. Therefore, finding enriched air cylinders marked with this color scheme in most international areas is expected, as dive shops and facilities around the globe adhere to these standards for enriched air operations.

In contrast, the other options suggest restrictive locations or contexts for these markings. While enriched air cylinders are indeed used in the United States, it is important to acknowledge that the international community also employs this system. It is not confined to recreational dive shops or military operations, as divers across various settings utilize enriched air, thus making the international standard applicable to a broader range of diving practices.