GRISSOM AIR RESERVE BASE, Ind., -- Airman Matthew Steele, an electrical and environmental technician with the 434th Maintenance Squadron, utilizes a torque wrench while installing a flow regulator on a yellow ?walk around? oxygen bottle. A heavy chain is used to hold the bottle firmly in place so it does not move. After installing the regulator a torque wrench is used to tighten the regulator to exact specifications. The "walk around" bottle is actually a small portable tank which holds oxygen under high pressure. These portable tanks are used by individual aircrew members in emergency situations or when oxygen is needed while an aircraft is in flight but a crew member cannot connect their breathing mask into the aircraft oxygen system. (Air Force photo/Staff Sgt. Chris Bolen)
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