This is what i was talking about:
Subsequent information from Steve Zaloga:
"One major point: Thunderbolt IV should be Thunderbolt VI. This mistake is based on my 12 year old drawing, but I've got better info since then (and I've illustrated the tank properly for example in the Osprey Warrior "US Tanker"). Abrams tanks in the ETO were:
Thunderbolt V, his M4 in France (a reworked early M4 with DV )
Thunderbolt VI, the M4A3 (76mm) which Brig. Gen. Bruce Clarke forced on Abrams in the refit in Oct 44 after the Lorraine campaign as Clarke knew that if Abrams wouldn't use the new type, nobody else would
Thunderbolt VII, the M4A3E8 which he got during the refit after the Ardennes campaign in late Jan 45."
Here is the link
http://misc.kitreview.com/armourreviews/dml6255reviewcs_1.htmNick