What policy provides guidelines for the use of chock blocks?

The correct choice for the policy that provides guidelines for the use of chock blocks is CF Policy 6851.1. This policy specifically addresses the procedures, usage, and standards related to chock blocks within fire operations. Chock blocks are crucial for securing vehicles and preventing unintended movement, which is vital for safety during equipment operations.

Understanding the specific content of CF Policy 6851.1 is essential for ensuring that all personnel involved in fire operations are aware of the correct handling and application of chock blocks, which enhances safety and procedural compliance. This policy likely outlines the proper placement, maintenance, and inspection requirements for chock blocks to prevent accidents during vehicle operations on various terrains.

Other policies listed may cover different aspects of operations or equipment but do not specifically focus on the use of chock blocks, making them less relevant to the question at hand.