honestly if i was going to pick a singular event to bet my money on it would be to help the spartacist uprising to succeed. drop in a bit ahead of it, give rosa as much foresight as possible (warning her my very appearance could start altering it but i think it would allow a better game plan). provide them with advanced weapons, disassembled microfactories, body armor, communications gear, etc. M1A1 might suck for urban warfare i think assault weapons, body armor, and advanced training be best