The Church of Jesus Christ of Latter-day Saints announced the formation of its newest mission Sunday, a mission that will be the largest in terms of number of missionaries.

The new mission will be known as the Utah Salt Lake City Headquarters Mission, and is being created from what is currently known as the Family and Church History Headquarters Mission. It will officially become the 422nd mission of the LDS Church on Jan. 1.

The mission has 1,200 missionaries serving in the area, making it the largest by number of missionaries, but is one of the smallest geographically, second only to the Temple Square Mission.

Elder Craig C. Christensen of the Presidency of the Seventy announced the change Sunday in a meeting with missionaries in Salt Lake City.

“The Family and Church History Headquarters Mission has evolved over time to be a very unique mission. It has also experienced remarkable growth. This new mission will allow these wonderful missionaries to further the work in many meaningful ways,” he said.

The missionaries serving in the mission will serve with the church’s Temple Department, military relations, security, building maintenance, working on family history work and other areas.

Senior missionaries serving in the mission can also be assigned to local branches and proselytize in the downtown areas outside normal office hours.

The mission will be comprised of service missionaries, full-time missionaries, senior couples and single sister missionaries.

President Warren G. Tate will serve as mission president. President Clark Larson and President Randy Hansen will serve as counselors.