This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
US Navy NO Chief Engineer's Aide Charles Danley center assisted by Engineer's Aide William McKenzie left and Lt. James Langlois uses Dual Mass Dynamic Cone Penetrometer to test soil firmness in the base o. en Al Asad Iraq May Chief Engineer's Aide Charles Danley center assisted by Engineer's Aide William McKenzie left and Lt James