Hello,
Thanks for your inquiry.
To get more advanced armaments, you need to upgrade the munition factory.
- Level 1 league munition factory produces Me 323 Gigant Transport.
- Level 2 league munition factory produces M40 Gun Motor Carriage and the aforesaid.
- Level 3 league munition factory produces B-29 Strategic Bomber and the aforesaid.
- Level 4 league munition factory produces Flakpanzer IV Wirbelwind, Me P.1101 Jet Fighter and the aforesaid.
- Level 5 league munition factory produces Panzer VIII Maus and the aforesaid.
- Level 6 league munition factory produces Katyusha Rocket and the aforesaid.