The human eyes can only see so much. Airmen from the Osan Air Base (51stfw) Non-destructive Inspection shop use special tools, liquid and lights to assist in identifying near-microscopic cracks in aircraft parts, support equipment and other imperfections. Just one more way our maintainers are keeping our force safe! #NDI #AirForce #Airmen #MilitaryPhotograph #Maintenance #Aircraft #Safety (U.S. Air Force photos by Staff Sgt. Greg Nash)