Final answer:
The question asked does not have a direct answer provided in the reference information. Each mission organization may have different requirements for a U.S. missionary, which could include ministerial credentials or ministry experience.
Step-by-step explanation:
The requirement for an applicant who desires to begin the process to become a U.S. missionary is not explicitly defined in the provided information, as missionary work can vary widely in its requirements. Generally, it may depend on the church or mission organization the applicant is looking to serve with. Some may require ministerial credentials, while others might emphasize experience in ministry or a related field. The provided reference information outlines requirements for naturalization in the United States and criteria for holding certain governmental positions, but does not directly answer the question regarding missionary work.