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2. Testing and inspection of diving cylinders - Wikipedia

   en.wikipedia.org/wiki/Testing_and_inspection_of...

   Blowdown silencer for emptying scuba cylinders Before internal inspection the valve must be removed after depressurising and verifying that the valve is open. Cylinders containing breathing gases do not need special precautions for discharge except that high oxygen fraction gases should not be released in an enclosed space because of the fire ...

3. Diver certification - Wikipedia

   en.wikipedia.org/wiki/Diver_certification

   NAUI Nitrox diver certification card. A Diving certification or C-card is a document (usually a wallet sized plastic card) recognizing that an individual or organization authorized to do so, "certifies" that the bearer has completed a course of training as required by the agency issuing the card.

4. Vehicle registration plates of Washington, D.C. - Wikipedia

   en.wikipedia.org/wiki/Vehicle_registration...

   Personalized, Disabled American Veteran, and personalized disabled person also available. Blue Knights: B K I 1234 [9] Breast Cancer Awareness B C A 1 B C A 12 B C A 123 The Children First Foundation October 23, 2013–present C F F 1234 College of William and Mary: C W M 1234 D.C. Firefighters Local 36 F F A 1234 Delta Sigma Theta sorority D S ...

5. Human factors in diving equipment design - Wikipedia

   en.wikipedia.org/wiki/Human_factors_in_diving...

   The material and pressure rating of cylinders affects convenience, ergonomics, and safety. Aluminum alloy and steel are the two commonly available materials that are most often used for scuba cylinders. Their strength to weight ratio allows the manufacture of scuba cylinders that are near neutral buoyancy when empty.

6. Diver communications - Wikipedia

   en.wikipedia.org/wiki/Diver_communications

   A diver down flag, or scuba flag, is a flag used on the water to indicate that there is a diver below. Two styles of flag are in use. Two styles of flag are in use. Internationally, the code flag "alpha", which has a white hoist and blue swallowtail fly, is used to signal that the vessel has a diver down and other vessels should keep well clear ...

7. Caisson rolling again: Famed military horse unit resumes ...

   www.aol.com/news/caisson-rolling-again-famed...

   Each horse has a custom-fit saddle, scrapping the historic model used for 75 years. The Army also modified the wagon they haul, dropping as much as 1,400 pounds from the load.