WWII Discharge Paper, What Does This Mean?

Question

I have no idea what the information on my grandfathers WWII Discharge and Separation Qualification Record is or means (he is now deceased and never discussed his military service) can someone please explain the below?

My grandfathers discharge paper lists his "Military Occupational Specialty And No" as "Geodetic Computer 243" and "Military Qualification And Date" as "Ex Carbine (space) May 44"

Here is a Quote from the "Separation Qualification Record"

"

Worked in a Field Artillary Observation Battalion in the ETO for 3 Months; worked as flash observer and as computer in Headquarters; correlated angles of flash from various posts to plot location of Enemy Artillery on maps."

Whats this mean? Please help!

Battery B 14th Field Artillery Observation Battalion (lions patch, possibly attached to the 106th Infantry Division?)

Answer 1

a person who is a computer is not a machine. He observes flashes coming from the guns of the enemy artillery(those are the big guns that shell things and blow them up) By checking where the flashes

come from he can 'compute' or figure out out exactly where the guns are located and then come up with directions for a map to show where to either drop bombs on the enemy artillery or fire on their gun locations to destroy them. This would be done at night and involved

a high level of mathematical ability and skill

Answer 2

Geodetic Computer 243 just meant that he looks at enemy artillery fire and computes their grid coordinates or location on a map by using back azimuths and triangulation, which is the computer part of it except this was all done in his head and on paper most likely not a real "computer" as we know them today.

The second part Ex Carbine May 44, just meant that he qualified as Expert with his assigned weapon which was most likely the M1carbine and he did so on May 1944.  So he was a great shot with a rifle basically.