Generally speaking, soldiers needed to receive comprehensive physical and military skills training during recruit training, so textbooks might not be necessary. In addition, soldiers usually did not use specific teaching materials when carrying out missions. Instead, they would receive training and practice according to the needs of the mission. However, if soldiers wanted to retain some opportunities to learn, they could apply to participate in some training programs, which might include learning some military knowledge and skills, as well as reading some related books and materials. In addition, some armies would provide soldiers with e-books and Internet resources to help them learn and develop their skills and knowledge. Therefore, if soldiers want to retain some opportunities to learn, they can bring some personal books and materials, but the specific requirements and regulations may vary from army to army and country to country. You need to carefully check the relevant notices and documents.