Any WWII history buffs here? Can someone tell what was involved in applying to OCS during that time?

[Backseat Driver]

5. My dad was employed by THE

local phone company pre-war and after high school. The anecdote was that he was asked to attend training at Yale in his home state that he had left in 1933, reuniting the whole family in NE Ohio. He took Signal Corp training at Yale and was then drafted into the service at some point and sent by troop ship to the Pacific theater, the Philippines and Papua New Guinea to install and guard communication lines in support of troops. Didn't ever talk much about his time in the Army. Never heard that he was ever offered or requested OCS training nor did he ever make use of the GI Bill for college after the war. He returned to his employer, got married, had kids, and worked there his whole career in Central Office Repair and, eventually, a long-distance analyst until his retirement.