OK, this is very simple, what 5 to 10 units would you like to have served in if you could be magically transported back to WWII, young and fit? Mine are as follows:
1st Special Service Force (US/Canada)
82nd Airborne Div. (US)
101st Airborne Div. (US)
1st Infantry Div. (US)
Alamo Scouts (US)
2nd Armored Div. (US)
4th Armored Div. (US)
6th Airbourne Div. (UK)
1st Airbourne Div. (UK)
7th Armoured Div. (UK)