You'll find a great deal more in reference to the 50th Division of the British Army in WW2 than you will about the American 50th Infantry Division.
The reason for this is that the American "50th Division" was what was called a Ghost or Phantom Division.Several of these Divisions were created for the purpose of confusing the enemy into believing these organizations actually existed.They did exist--but only as small Company-sized units charged with sending radio traffic, receiving mail, and other trickery intended to appear as thought a 15,000 man outfit was on the sending/receiving end rather than 100-odd guys.
There were about a dozen Infantry Divisions created for this purpose and I believe six Airborne Divisions, as well as ten or so British Infantry units.
All together these several Divisions formed a larger organization called FUSAG (First U S Army Group)
The original FUSAG actually became the 12th Army Group under Omar Bradley which ran the Invasion of Normandy.
When Bradley took over 12th Army, FUSAG was retained "on paper" and was under the very visible command of George Patton.The Germans expected Patton to lead the Invasion, and thus the deception proved successful as the Germans kept vital reenforcements tied up anticipating the Invasion at Pas de Calais rather than at Normandy...even after it happened on June 6.
Again, the 50th US Infantry Division was one of those making up Patton's Phantom 1st U S Army Group.