Metal Grinder Navy Petty Officer 1st Class Christopher Hirth grinds a piece of metal aboard the guided missile cruiser USS Bunker Hill in the Pacific Ocean, June 24, 2020. SHARE: Download: Full Size (1.75 MB) Tags: Navy Credit: Navy Petty Officer 3rd Class Nicholas Huynh VIRIN: 200624-N-IW125-1044W.JPG Photo Gallery