We are being issued with Drager Oxy 3000 oxygen masks for use in a burnover emergency. They are stored in the canister pictured above either under or behind or between the seats, depending on the vehicle. It is anticipated there will be a training model available. The units in the trucks should not be opened unless required in an emergency.
General information on the masks is available here: emergency-mask-info-sheet
Information on how to don the mask follows (click on image to enlarge it):