found a few pieces to the puzzle but it brings to light that the 74th AAA gun Bn was Not his original unit.
According to this document: http://www.cgsc.edu/CARL/nafziger/941UXAD.PDF the 74th had a short life.
Date
Raised Unit Name Notes
1 Apr 44 74th AAA Gun Bn (Mobile) Disbanded 23 Dec 44
the raised date indicates the 74th was redesignated, most likely from a 1st Battalion of an AntiAircraft Regiment or Coast Artillery Regiment that was reorganized into the Group/Battalion form in Italy.
Now we have to figure out which regiment it was.
I havent found the 74th listed in any 5th Army Order of Battle which means they were probably under command of the Peninsular Base Section in Italy.
A document posted by janis337 in post#10 at; http://www.6thcorpscombatengineers.com/engforum/index.php?showtopic=5268
The 370th Engineer Combat Bn was formed from the 74th AAA Gun Bn on 31 December 1944 at Gignac, France. 370th`s location in August 1945 was Ulm, Germany. Arrived Boston Port of Embarkation 13 Nov 45, Inactivated 14 Nov 45 at Camp Miles Standish, Mass.