1. Military officer to another branch officer of roughly equal rank, who have known each other for years on good terms (I'm thinking vy when they're on duty, ty when off?)
2. Military officer to a lower-ranking officer
3. Officer/guard to a prisoner
4. Prisoners to each other (mostly at a first meeting--would it be typical to use ty to differentiate us v. them with the officers' vy, and which would be more sinister/revealing: a criminal leader addressing you ty or vy? )
The setting is a Soviet prison in the mid-fifties; the population is made up of both common criminals and political prisoners.