Howitzer Fire Marine Corps Cpl. Kyle Rayo, a field artillery cannoneer with Marine Rotational Force Darwin, fires a howitzer during Exercise Koolendong at Mount Bundey Training Area, Australia, Aug. 25, 2019. SHARE: Download: Full Size (3.57 MB) Credit: Marine Corps Lance Cpl. Nicholas Filca VIRIN: 190825-M-SK440-002.JPG Photo Gallery