07 February 2021 U.S. and Japan Conduct Bilateral Mine Warfare Exercise The U.S. Navy and the Japan Maritime Self-Defense Force (JMSDF), began Mine Warfare Exercise (MIWEX) 1JA 2021 off the coast of southwestern Japan, Jan. 28.MIWEX 1JA is part of an annual series of exercises between the U.S. Navy and Japan Maritime Defense Force (JMSDF) designed to increase...