2. Let Calliope switch between sherman HE shells and current rocket barrage with 10 sec cooldown
I dont think that the sherman in WW2 was able to rotate his turret after a calliope rocket launcher was installed on top.
About M1919:
Double lmg on riflemen was OP, but I really dont understand the sense of this weapon since it got limited to 1. Why should I spend 70mun to get a squad that is pretty meh at all ranges? 4 models of the squad have a M1 Garand which performs horrible on long range. A single M1919 squad will lose a 1v1 vs lmg grenadiers and you cannot charge in anymore for CQC. 1 or 2 BARs fit 10x more to riflemen IMO, even on super open maps.
Im wondering if it would be a good idea to replace the M1919 from infantry and tac support doc with something like a 2x thompson upgrade for riflemen which consumes both weapon slots, to give them access to a cheap but effective mid/closerange upgrade, similar to 2x STG44 from volks.
About the rest I agree as well, the quad flak upgrade should be a bit cheaper but still remain cuz it's MUCH better AA than the normal AA halftrack from Lieutenant (soon Captain) tech. And Calliope sucks hard right now. The HMG strafing run is a bit too overpriced but it's definitely not a horrible ability. It even destroys Stukas and Panzerwerfers if the enemy doesnt pay attention.