The phrase "top mission" is correct and usable in written English.
You can use it when describing a task or goal that is especially difficult or important to accomplish. For example, "He was determined to complete his top mission of restoring the old building to its original grandeur."
That led some to conclude that it had left the solar system, but top mission scientists disagreed, because Voyager 1 did not observe an expected change in the magnetic field.
Now the technology used to track the most elusive terrorist in history is at the centre of another top mission to help to enhance the life of cakes in British bakeries.
Since ending the Liberal Democrats' nearly unbroken 54-year grip on power in last summer's election, Mr. Hatoyama's Democratic Party has proclaimed its top mission to be changing the way the country is governed by a process that is commonly called "escaping the bureaucracy".
The government's draft National Digital Communications Policy this year said that data sovereignty is a top mission for the country.
Gladys Carrion, New York's current Commissioner of Families and Children Services, has made it her top mission in the year since she took office is to start closing New York's dismal youth facilities.
Given that cultural immersion and frugality were two of my top missions on this trip, the idea was too good to pass up.
A8 New Priority for Spy Agencies A new strategy document issued by the Bush administration ranks efforts to "bolster the growth of democracy" among the top missions for American intelligence agencies.
At a news conference announcing the agreement with the centrist Kadima Party, Mr. Netanyahu listed "advancing a responsible peace process" among the new coalition's four top missions, but was quick to reiterate his longstanding position that the process was stalled because of an unwilling partner, not lack of willingness within his camp.
The attorney general has made ending these local policies one of his top missions.
Mrs. Wells and her second husband were sent by President Franklin D. Roosevelt on a top secret mission to Africa to look for possible postwar homelands for Jews.
"It's a top secret mission so I can't talk too much about it but it could be the most exciting and ambitious thing I've ever done," Fogle told The Sun. "We might change what we know about the British Atlantic waters and what's in them".
