20 November 2020 U.S. Naval Forces and Japanese Maritime Self-Defense Forces Conduct Mine Warfare Exercise NICHINAN, Japan - The U.S. Navy and Japanese Maritime Self-Defense Force (JMSDF), began the at sea portion of Mine Warfare Exercise (MINEX) 3JA 2020 off the coast of southwestern Japan on Nov. 20.MINEX 3JA is part of an annual series of exercises between the U.S. Navy and allied navies designed to...