Which reference material covers dual point rigging?

TM 4-48.11 is the reference material that specifically covers dual point rigging. This technical manual provides detailed guidance on the procedures and techniques necessary for effectively conducting dual point loads during air operations. It includes illustrations, safety considerations, and operational details crucial for personnel performing these tasks. Understanding the nuances of dual point rigging is essential for maintaining safety and efficiency during air assault operations, as this technique allows for improved load stability and distribution, which are critical in various operational scenarios.

The other options address different aspects of helicopter operations and rigging techniques but do not specifically focus on dual point rigging, making TM 4-48.11 the best resource for this particular skill set.