May suggest for Pacific Campaign its not Historical Accurate buliding Flak 38 AA Gun in Pacific especially in Engineering Squad
The more accurate AA gun for Pacific is the Type 96 20mm AA Gun its both Tripple Barrel or 2 Barrel which both use in Imperial Navy and Imerial Army.
The Type 96 20mm AA gun which more accurate for Pacific since it is deploy in Guadalcanal and other places in Asia to counter
Allied Plane
They are two Type of Type 96 AA Gun the Tripple Barrel and 2 Barrel Type 96 AA gun