I have found it impossible to complete this mission successfully. The objective is "to kill as many enemy soldiers and disappear". In Veteran mode, the most I'm able to shoot from the water tower area are 4-5 before being discovered. Flanking the enemy proves useless as the mission seems to regard any movement away from the water tower as extraction, and when it does, the mission still ends in failure.
If there is a minimum number of soldiers that I need to kill it should be defined in the objectives, shouldn't it?
Has anyone had any luck with this mission?