I contacted the California State Military Museum in Sacramento to see if I could get more information on Robert Barbour Johnson's (short) stint in the army during World War II.
According to Dan Sebby, Director and Curator, the unit to which Johnson was assigned--Service Command Unit (SCU) 1952) was the permanent garrisoning party stationed at Fort Rosecrans, and so Johnson would have been involved not with the artillery batteries that were stationed at the Fort but to housekeeping services.
According to Dan Sebby, Director and Curator, the unit to which Johnson was assigned--Service Command Unit (SCU) 1952) was the permanent garrisoning party stationed at Fort Rosecrans, and so Johnson would have been involved not with the artillery batteries that were stationed at the Fort but to housekeeping services.