In Sarge's War:Edit
Regular soilders in Sarges war are used throughout the game repeatedly. If they survive the stage, they will remain back and "patrol" the area. If you truely want them to survive, search the stage, and be sure that you have elimated all enemies. As the level height increases, the usefulness of the regulars decease, save when one robs the tan of an army tank.
Altough almost the entire green army is destroyed, some posts of soilders remain, but most are quickly captured and need rescuing.