NEEDLE LESSON U.S. Navy Petty Officer 2nd Class Michael Hopper demonstrates the technique for urgent needle decompression of the chest with Marines participating in a squad competition in Mihail Kogalniceanu, Romania, Jan. 8, 2014. The procedure is commonly used to treat tension pneumothorax, a physical trauma to the chest causing the lung to collapse. Hopper is a hospital corpsman with Black Sea Rotational Force 14. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 610753-D-UTJ57-309.jpg Photo Gallery