Henry: I found a copy of the General Order activating the 259th CA Battalion, dated Jan 20, 1943.
(The 259th was formed by redesignating the 244th CA Battalion), and found also the Special Order, dated Jan 20, 1943, naming all personnel assigned to the 259th. Your dad, George A. Lowry, was assigned by that Special Order to HQ Battery, 259th. He is listed as rank "Technician Grade IV," along with his army serial number. (That TG-IV grade falls below the list of Sergeants, and above the Corporals...possibly meaning "Technical Sergeant?") The SO is several pages long, but I would be happy to scan it and email it to you if you want me to. Let me know.