"proper mission" is a correct and usable phrase in written English.
It is typically used to describe a task or action to be completed that is either a specific duty or a more general goal. For example: "My proper mission in life is to help others in need."
The first proper mission you play is a revelation.
Is providing cheaper rents the real and proper mission of social landlords?
Princeton's proper mission is to oppose this destruction in every way possible.
"They can go there, they can inspect, but they shouldn't raise questions outside their proper mission," the ambassador said.
The greater part of modern theatre music suffers from the mistake of seeking to repeat the scenes passing on the stage, instead of fulfilling its own proper mission of interpreting the attitudes of the persons represented.
Mr. Eide's success will depend not only on his skills, but also on the friends of Afghanistan at the United Nations providing him with the proper mission, mandate and resources.
Attaining a diverse student body is at the heart of the Law School's proper institutional mission, and its "good faith" is "presumed" absent "a showing to the contrary".
Attaining a diverse student body is at the heart of the Law Schools proper institutional mission, and its good faith is presumed absent a showing to the contrary. Id., at 318319.
Our conclusion that the law school has a compelling interest in a diverse student body is informed by our view that attaining a diverse student body is at the heart of the law school's proper institutional mission, and that "good faith" on the part of a university is "presumed" absent "a showing to the contrary".
See off Starjan, Qarabag and Malmo for the Champions League proper was the mission.
The Mars rover Curiosity is indulging in a flurry of multimedia activity ahead of its science mission proper.
