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In this image courtesy of the US Air Force, a US Air Force security forces raven, assigned to the 816th Expeditionary Airlift Squadron, maintains a security cordon around a US Air Force C-17 Globemaster III aircraft in support of Operation Allies Refuge at Hamid Karzai International Airport (HKIA), Kabul, Afghanistan, on August 20, 2021. Taylor Crul / US AIR FORCE / AFP

In this image courtesy of the US Air Force, a US Air Force security forces raven, assigned to the 816th Expeditionary Airlift Squadron, maintains a security cordon around a US Air Force C-17 Globemaster III aircraft in support of Operation Allies Refuge at Hamid Karzai International Airport (HKIA), Kabul, Afghanistan, on August 20, 2021. Taylor Crul / US AIR FORCE / AFP

In this image courtesy of the US Air Force, a US Air Force security forces raven, assigned to the 816th Expeditionary Airlift Squadron, maintains a security cordon around a US Air Force C-17 Globemaster III aircraft in support of Operation Allies Refuge at Hamid Karzai International Airport (HKIA), Kabul, Afghanistan, on August 20, 2021.
Taylor Crul / US AIR FORCE / AFP

In this image courtesy of the US Air Force, a US Air Force security forces raven, assigned to the 816th Expeditionary Airlift Squadron, maintains a security cordon around a US Air Force C-17 Globemaster III aircraft in support of Operation Allies Refuge at Hamid Karzai International Airport (HKIA), Kabul, Afghanistan, on August 20, 2021.
Taylor Crul / US AIR FORCE / AFP