hsshould take place before and after the observers because a high mission one that is well prepared operates effectively on the ground and is properly monitored
This cooperation should take place before, during and after the deployment of observers, because a high quality mission is one that is well prepared, operates effectively on the ground and is properly monitored.
This should take place before, and after the of observers, because a high mission one that is well prepared, operates effectively on the ground and is properly monitored.