How is aviation breathing oxygen cylinders identified?

• A. White band around the green cylinder or the words "aviators breathing oxygen" painted on the cylinder
• B. Red body with white cross
• C. Blue stripe
• D. Yellow label

Answer: (A)

Aviation breathing oxygen cylinders are identified by a green body with a white band around it, or by having the words “aviators breathing oxygen” painted on the cylinder. This clear color-and-marking scheme lets crew quickly recognize the oxygen supply dedicated to flight personnel, reducing the chance of using the wrong gas. The other options don’t fit because they correspond to different equipment or indications (for example, a red body with a white cross is typically associated with medical or first-aid items, while a blue stripe or a yellow label aren’t the standard marks used to identify aviator’s breathing oxygen).