In June 1942 he joined the United States Naval Reserves with service in the Mines Countermeasures Section, Research Division, Bureau of Ordinance until 1944 when he went to the General Ordinance School then the David W. Taylor Model Basin.
This passage describes a person's military service from June 1942 to 1944, including their initial enlistment in the Naval Reserves, training at the General Ordnance School and the David W. Taylor Model Basin.