Nick answered...

"Required" is an interesting word when it comes to faith and religion. In the Mormon Church no one is "required" to serve a mission. Church membership is not revoked for not serving a mission. In this sense, they are not required, yet serving a mission is encouraged at many stages in life and in many different capacities throughout the world.

Missionary service is a tremendous blessing, a challenge, and one of the main focuses of the faith. The life of Jesus Christ was the life of a missionary in many respects. Performing service for one another, preaching the glad message of the gospel, and increasing the faith and dedication of God's children are exemplified in Christ's life and mirrored by those in missionary service.

To dedicate a portion of one's life in service propels those who serve and those who are served into a better life. During my two year mission to Baton Rouge, Louisiana, and during my two year service mission with LDS Family Services, I was greatly blessed and strengthened. (I hope those whom I served found some value in my service as well.) That strength has taught me to better navigate this life, has kept my family relations intact, and has been the method of helping others overcome their trials as well.

Spiritually speaking, I don't find value in reflecting on what my life would be like without serving a mission. Instead, I rejoice in knowing that without that time in missionary service my life would be significantly less happy and productive. In my life, serving a mission has taken on many of the characteristics of a "required" act since I can't picture myself progressing very far without having served as a missionary. While not required to be a member of the Mormon church, missionary service has been a critical and welcome part of my life and growth spirituality. I will be forever grateful that I had the opportunity to serve missions, and look forward to serving in many more.