Trilateral Troops U.S. Marines join forces with Spanish and Portuguese troops during a trilateral exercise as part of Trident Juncture 15 in Pinheiro da Cruz, Portugal, Nov. 3, 2015. The U.S. Marines are with Special Purpose Marine Air-Ground Task Force-Crisis Response-Africa. U.S. Marine Corps photo by Staff Sgt. Vitaliy Rusavskiy SHARE: Download: Full Size (0.49 MB) Credit: Staff Sgt. Vitaliy Rusavskiy VIRIN: 151103-D-HV319-036.JPG Photo Gallery