Airmen 1st Class Angelito Kamatoy and Nathanael Markley, 36th Logistics Readiness Squadron cryogenic production technicians, pull a daily sample from a tank April 8, 2015, at Andersen Air Force Base, Guam. Cryogenics airmen pull a sample every 24 hours to ensure liquid and gaseous nitrogen that are produced are 99.5% pure. (U.S. Air Force photo by Senior Airman Katrina M. Brisbin/Released)
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