Since I only have 3 players, I added another 3 squad mates with character sheets, personality to flesh out the squad and fill in certain roles that the other players are missing. I did tell the Sergeant player that he can tell them what to do in and outside of combat otherwise I am in control, but made sure to keep it very simple in combat.
However they are starting to steal the light from the players. Both in combat and in skill tests. I see where I went wrong with them.
Because of this, I am planning on having them slowly killed off. One of them has already had his guts spilled open and is on the verge of death, so I guess he can be the first to die.
This could also be a good experience for them. For me as well, as a GM.
Now my question is, have you had GM controlled PCs before? Does it work for you? Is it something that requires a lot of attention so it doesn't get out of control? Any tips for using them?