Rock hard
Senior Airman Walter Herandez, 379th Expeditionary Civil Engineer squadron pavement and heavy equipment journeyman, places a boulder, Oct. 11, 2009, in Southwest Asia. The 379 ECES pavement and heavy equipment section placed large boulders around U.S. Air Force assets for an added measure of force protection. (U.S. Air Force photo/Staff Sgt. Robert Barney)