Lieutenant Col. Troy Roesti, executive officer of the 31st Marine Expeditionary Unit, greets soldiers of 12th Infantry Regiment, 8th Division, Western Army, Japanese Ground Self Defense Forces, during their arrival here, May 29. As part of the Japanese Observer Exchange Program, the soldiers will live alongside Marines and Sailors of the 31st MEU while observing approximately three weeks of amphibious operations. By sharing small unit concepts and tactics for amphibious operations, the two forces aim to increase interoperability and strengthen bilateral response to future challenges. - Lieutenant Col. Troy Roesti, executive officer of the 31st Marine Expeditionary Unit, greets soldiers of 12th Infantry Regiment, 8th Division, Western Army, Japanese Ground Self Defense Forces, during their arrival here, May 29. As part of the Japanese Observer Exchange Program, the soldiers will live alongside Marines and Sailors of the 31st MEU while observing approximately three weeks of amphibious operations. By sharing small unit concepts and tactics for amphibious operations, the two forces aim to increase interoperability and strengthen bilateral response to future challenges.