Soldiers with the 1st Amphibious Rapid Deployment Regiment, Japanese Ground Self-Defense Force, create field expedient antennas at Combined Arms Training Center Camp Fuji, Japan, March 19, 2022. 1ARDR soldiers were taught when a field expedient antenna could be used as well as how to build one. Maritime Defense Exercise Amphibious Rapid Deployment Brigade is a bilateral exercise meant to increase interoperability and strengthen ties between U.S. and Japanese forces for the defense of Japan. - Soldiers with the 1st Amphibious Rapid Deployment Regiment, Japanese Ground Self-Defense Force, create field expedient antennas at Combined Arms Training Center Camp Fuji, Japan, March 19, 2022. 1ARDR soldiers were taught when a field expedient antenna could be used as well as how to build one. Maritime Defense Exercise Amphibious Rapid Deployment Brigade is a bilateral exercise meant to increase interoperability and strengthen ties between U.S. and Japanese forces for the defense of Japan.