U.S. Marine SGT. Andrew L. Isaacs shows a .50 caliber machine gun with an AN/TVS-5 weapon sight mounted on a High-Mobility Multipurpose Wheeled Vehicle (HMMWV) to a sailor from the People's Republic of China aboard the U.S. Navy dock landing ship USS Germantown (LSD 42). The Germantown pulled into Qingdao for a scheduled five-day port visit