Testing officer (Call of Duty: Modern Warfare (2019))

Evening, good! People tell me, trying to pass the test officer Just work which opens at the 152 level, the essence of it is that Kill three or more enemies in a row (triple kill or higher), capturing protected their goal. Maybe someone did, explain me in what mode to be executed, and any required conditions must be met, and that I was trying still counts. Thanks in advance.