Where did the term SCUBA come from?

The report titled On Using Self-Contained Underwater Breathing Apparatus was written by Walter A. Hahn and Christian J. Lambertsen in 1952. A really interesting read from the early days of Scuba Diving. They cover the swimmer, the physics and physiology of diving along with training in both open circuit and closed circuit scuba. They are quick to point out that this is not a training manual.

On Using SCUBA