Maybe I'll finish with USMC here, because it's largely the same:
30 75mm Howitzer - M1A1 pack howitzer usually uses icon 2111 (like units 123-125) (drawing:
https://www.tauniverse.com/forum/att...1&d=1189101831)
145,146 75mm Abn PH - the same as above (wrong twin trail icon besides)
380 75mm M1897 FG - I don't know if the Marines used more modern split trail M2 carriages, but in that case a better icon would be 2164
381 75mm M1916 FG - I suggest a shorter barrel icon 2163
386 75mm M1916 Bty - photo is M1897, correct is 9399
That's all.