The Mission Call
After a prospective missionary has asked to serve a mission and has met the requirements he/she receives a letter in the mail stating where to serve, what language to teach in, and when to report to a missionary training center. The letter is the mission call -- a written vocation to temporary ministerial service.
This is not Breksa Shimai's mission call, but used here as an example of the call's wording and duties of a missionary.