Airman Alberto Padilla, 374th Civil Engineer Squadron structural apprentice, places a wooden barrier into place during a facility hardening exercise at Yokota Air Base, Japan, March 14, 2018. The hardening exercise showcased the 374th CES’ capability of erecting barriers and boarding windows quickly in the event of an attack. (U.S. Air Force photo by Airman 1st Class Matthew Gilmore)

- Image ID: MD7E26

Airman Alberto Padilla, 374th Civil Engineer Squadron structural apprentice, places a wooden barrier into place during a facility hardening exercise at Yokota Air Base, Japan, March 14, 2018. The hardening exercise showcased the 374th CES’ capability of erecting barriers and boarding windows quickly in the event of an attack. (U.S. Air Force photo by Airman 1st Class Matthew Gilmore)

AB Forces News Collection / Alamy Stock Photo

Image ID: MD7E26

This image is a public domain image, which means either that copyright has expired in the image or the copyright holder has waived their copyright. Alamy charges you a fee for access to the high resolution copy of the image.