Heavy Artillery [Image 3 of 3] by DVIDSHUB on Flickr.

Via Flickr:
Marines with Battery N, 5th Battalion, 14th Marine Regiment, fire an M777 A2 howitzer during a series of integrated firing exercises at the Combat Center’s Quakenbush Training Area April 26, 2013. (Official USMC photo by Cpl. William J. Jackson/Released)