There are three different versions of this quest, all bearing the same name. Each version is a limited repeatable quest which can be completed 10 times. Upon completion of the final iteration of a version, the following version becomes available. Only upon the completion of the final iteration of the third version will the following quest be the master quest: Surface Assault.
If you do not like your target mob you may delete the quest and immediately be offered a new one with (hopefully) a better target mob.