There are some experiments using turret style drones to maintain like DMZs. They still need a human operator. That is a case where you are mostly just waiting though.
Seizing a town means dealing with a ton of civilians - negotiating, handling mixed reports, etc. Drones may become part of that but cameras are imperfect and you will need people unless Drone tech has a giant leap in human interfacing.
There are some experiments using turret style drones to maintain like DMZs. They still need a human operator. That is a case where you are mostly just waiting though.
Seizing a town means dealing with a ton of civilians - negotiating, handling mixed reports, etc. Drones may become part of that but cameras are imperfect and you will need people unless Drone tech has a giant leap in human interfacing.