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Chief Master Sgt. Matt Lyons, 167th Aeromedical Evacuation Squadron medical technician, explains the liquid oxygen system used onboard C-130H Hercules aircraft at Captain Andalla Cissé Air Base, Senegal, March 22, 2018. The 167th AES is in Dakar in support of African Partnership Flight Senegal, a military-to-military event co-hosted by Senegal and the U.S. focusing on casualty evacuation, aeromedical evacuation and air and ground safety. (U.S. Air Force photo by Airman 1st Class Eli Chevalier)
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