Which reference material covers pathfinder operations?

The correct reference material covering pathfinder operations is ATTP 3-18.12. Pathfinder operations focus on the coordination and execution of air assault missions, which includes managing landing zones, drop zones, and other air movement tasks to ensure mission success. ATTP 3-18.12 provides a comprehensive guide to these operations, detailing the roles and responsibilities of pathfinder teams, and outlining the procedures for air load planning, air traffic control, and emergency response during air assaults.

The other options, while related to military operations and aviation, do not specifically address the intricacies and protocols that govern pathfinder operations, making them less suitable references for someone looking to understand this specific area of Army operations.