U.S. Marines and Japan Ground Self Defense Force soldiers receive a safety brief before beginning urban explosives breach training during exercise Iron Fist 2018 at Marine Corps Base Camp Pendleton, Calif., Jan. 18, 2018. The Marines are assigned to 1st Combat Engineer Battalion. Exercise Iron Fist is an annual bilateral training exercise where U.S. and Japanese service members train together and share techniques, tactics and procedures to improve their combined operational capabilities. Marine Corps photo by Lance Cpl. Robert Alejandre