I have added some data on casualties from battles and by Division from WW2, Eastern Theatre of Operations. As noted earlier, the 30th Division was recognized as the number one Division of its kind in the ETO. I have also added the casualties from Gettysburg, from both the Union and Confederate sides for comparison.
Note that the Battle of Bastongne was a part of the Battle of the Bulge, and the Battle of Mortain was part of the Battle of Normandy.
Without lessening the courage and impact of the airborne divisions (the 82nd and the 101st), it is interesting that the 30th suffered more losses than those two storied Divisions combined.
Casualties by Battles
Days Casualties Killed
Battle of the Bulge 40 89,000 8,000
Battle of Bastogne 18 3,000 500
Battle of Aachen 20 5,000
Battle of Hurten Forest 90 33,000 to 55,000
Battle of Normandy (all allies) 85 225,000
Battle of Mortain 7 2,000 to 3,000
Casualties by Division
30th Division 18,466 3,003
1st Division 20,649 3,616
29th Division 20,620 3,887
35th Division 15,822 2,485
90th Division (of Alle Savel) 19,200 3,342
99th Division 6,553 993
82nd Airborne 9,073 1,619
101st Airborne 9,328 1,766
Battle of Gettysburg (both sides) 4 46,000 to 51,000