Katyusha's birthday is on January 31st.

Oh great what a way to blow your cover Nonna and Klara you had one job

Well I guess their feeling of duty toward Katyusha is stronger than the rest

2 BIG reason why the camouflage failed

Pavlov's response is really a heck of a thing.

Also, Katyusha can act silly at times, but she didn't get to be commander for no reason.