The Kentucky Air National Guard's Master Sgt. Jason Smith reads a Shippers' Declaration for Dangerous Goods to ensure that a 400-gallon liquid oxygen tank is properly prepared for flight Jan. 18, 2012, while deployed to McMurdo Station, Antarctica. Smith is supporting Operation Deep Freeze as NCOIC of joint inspection and rigging for the fourth rotation of the 2011-12 Deep Freeze season. (U.S. Air Force photo by Tech. Sgt. Raymond Graves)