What is a requirement for welcoming an incoming soldier?

Sending a welcome letter is an important requirement for welcoming an incoming soldier because it serves as a formal introduction to the unit culture and the resources available to them. A well-crafted welcome letter can provide crucial information about the unit, highlight key personnel, and outline the expectations for the soldier's integration into the team. This gesture not only helps the incoming soldier feel valued but also sets a positive tone for their transition, making them aware that the unit is invested in their arrival and success.

The other choices, while beneficial for integrating a soldier into the unit, do not directly fulfill the essential requirement of an initial welcome. Scheduling a training session, assigning a mentor, or providing a deployment kit are all supportive actions that can enhance the transition experience, but they are not the fundamental step of formally welcoming the soldier upon their arrival.