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Cryo techs go below zero

Senior Airman Steven C. Rehana purges a liquid oxygen cart.

U.S. Air Force Senior Airman Steven C. Rehana, 380th Expeditionary Logistics Readiness Squadron cryogenics technician, purges a liquid oxygen cart at Al Dhafra Air Base, United Arab Emirates, April 15, 2021. The cryogenics flight is responsible for providing more than 4,000 gallons of liquid oxygen per month to aircraft. (U.S. Air Force photo by Staff Sgt. Miranda A. Loera)

Senior Airman Steven C. Rehana opens a valve to release liquid oxygen.

U.S. Air Force Senior Airman Steven C. Rehana, 380th Expeditionary Logistics Readiness Squadron cryogenics technician, opens a valve to release liquid oxygen at Al Dhafra Air Base, United Arab Emirates, April 15, 2021. Airmen with the cryogenics shop provide sustainable air for aircrew members to breathe at high altitudes. (U.S. Air Force photo by Staff Sgt. Miranda A. Loera)

Senior Airman Steven C. Rehana drains liquid oxygen to collect a sample.

U.S. Air Force Senior Airman Steven C. Rehana, 380th Expeditionary Logistics Readiness Squadron cryogenics technician, drains liquid oxygen to collect a sample at Al Dhafra Air Base, United Arab Emirates, April 15, 2021. Cryogenics technicians perform refills every two to three days in order to provide oxygen for aircrew members. (U.S. Air Force photo by Staff Sgt. Miranda A. Loera)

Senior Airman Steven C. Rehana collects a liquid oxygen sample.

U.S. Air Force Senior Airman Steven C. Rehana, 380th Expeditionary Logistics Readiness Squadron cryogenics technician, collects a liquid oxygen sample at Al Dhafra Air Base, United Arab Emirates, April 15, 2021. Cryogenic technicians work with extremely cold substances that boil at subzero temperatures then evaporate into breathable air. (U.S. Air Force photo by Staff Sgt. Miranda A. Loera)

AL DHAFRA AIR BASE, United Arab Emirates -- U.S. Air Force Senior Airman Steven C. Rehana, 380th Expeditionary Logistics Readiness Squadron cryogenics technician, purges a liquid oxygen cart at Al Dhafra Air Base, United Arab Emirates, April 15, 2021. The cryogenics flight is responsible for providing more than 4,000 gallons of liquid oxygen per month to aircraft. (U.S. Air Force photo by Staff Sgt. Miranda A. Loera)