During the Labor Day Airshow reenactor bivouac we sponsor annually, I decided to do an inservice on the Oxygen Breathing Apparatus (OBA), which figures prominently in COD's history (we almost blew ourselves to smithereens when an electric fish caught fire after a battery explosion in 1945)... we took a live OBA cannister and loaded it in a relatively recent OBA (the WWII ones aboard COD are artifacts not to be damaged). It was an interesting event and several took turns breathing the oxygen byproduct of the cannister's chemical reaction. Here we see COD crewman Donnie Fuller, with assitance from a WWII Army reenactor (who did lots of service aboard Navy ships with OBAs) lending a hand do eject the spent cannister into cooling water.