=> Buff Katy to Pwerfer/Stuka/Callips standards so SOV/USF team-ups will not have to force USF players to go Callips to fill the gap of lack of rocket arty.
Only change Katyusha needs imo is buff to its vet1 Creeping Barrage, because now it sucks for 90muni.
Stuka is OK
Pwefer/Calliope should be toned down