This is an original WW2 U.S. Army Air Forces instruction sheet issued for the Type A-9 Oxygen Mask, dated 30 March 1942. Officially titled “Instructions for the Type A-9 Oxygen Mask for Use with Demand Type Regulator Only”, the document was produced under the authority of the Chief of the Air Corps via the Air Service Command, Field Service Section at Wright Field, Dayton, Ohio. Marked Restricted, it reflects early-war USAAF operational procedures during the rapid expansion of American military aviation following U.S. entry into the conflict.

The Type A-9 oxygen mask formed part of the USAAF’s high-altitude life-support equipment, and documentation such as this was issued to ensure correct fitting, use, and maintenance by aircrew and ground personnel. Dated examples from early 1942 are particularly scarce, making this a desirable supporting item for displays relating to USAAF flight equipment, oxygen systems, or wartime aviation medicine within the United States Army Air Forces.

Also included is the original brown envelope containing the associated helmet hooks and webbing attachments. The envelope is open, as shown in the photographs, and all items visible are included.

The instruction sheet survives in good original condition, showing expected period folds, light creasing, and surface wear consistent with wartime handling and storage. The paper remains complete and structurally sound, with clear, legible text and illustrations throughout, and notably no handwritten additions, which are commonly encountered on operational paperwork of this type. Overall, this is an honest and well-preserved piece of early WW2 USAAF documentation with strong historical and display appeal.