A U.S. airman stationed at Yokota Air Base, Japan, was pronounced dead on May 30 after being discovered unresponsive in an on-base dormitory.Details surrounding the death of Airman 1st Class Sean S. Chase, an aircraft services technician assigned to the 730th Air Mobility Squadron, are under investigation, according to a Tuesday release from the 374th Airlift Wing.“He was loved by those around him, and he loved those around him in return,” Lt. C…