The phrase "additional mission" is correct and usable in written English.
It can be used when referring to an extra task or objective that is added to an existing set of responsibilities or goals.
Example: "The team was assigned an additional mission to improve community outreach efforts this quarter."
Alternatives: "extra task" or "supplementary objective".
Applying neuroscience in this way will become an additional mission for ECNP.
His task could easily become complicated by the actions of drivers around him and the additional mission of making sure Renault also win the constructors' championship.
But each additional mission served to underscore U.S. superiority over the Soviets in space, effectively giving the U.S. return on its investment along the way.
To even consider falling below the strength that Mr. Brown said he needed in 1990 -- especially at a time when the department has the additional mission of guarding against terrorism -- would seem to be folly.
But if the lazy, freeform rhythms of the main storyline prove too unfocused for some players, an additional mission mode offers a number of short-paced challenges in which you must, for example, collect all the fruit in an environment against the clock, competition for a gold, silver or bronze medal.
Those assets, which were not part of OSD's justification analysis, will drive up requirements for pilots and support personnel, along with additional mission support aircraft such as air-to-air refueling tankers.
NASA has no additional missions planned for the ringed planet, though several proposals are in the works.
The Savannah was inactivated that fall but recalled for several additional missions before being taken out of service for good in 1862.
It's a more substantial campaign than you'll find in recent shooters such as Homefront, with additional missions and secrets adding replay value and a certain self-awareness that was lacking from the rather humourless original.
During the next three days, the lidar plane flew additional missions, this time over T2 and T3; by the time they were done, the team had mapped fifty-five square miles of Mosquitia rain forest.
Officials said the National Guard and Reserves, which as of Wednesday had 201,099 members on active duty, would probably have to shoulder some of the burden of any additional missions as well.
