Sandbag Effort U.S. Marines and sailors work with a Peruvian marine to fill sandbags during a class on constructing fighting positions in Ancon, Peru, Sept. 3, 2016. The U.S. forces are assigned to Force Koa Moana, which is in Peru to improve interoperability with Peruvian marines. Marine Corps photo by. Sgt. Jacob Smith SHARE: Download: Full Size (1.33 MB) Credit: Sgt. Jacob Smith VIRIN: 160903-M-CX198-118C.JPG Photo Gallery