What is an operation in which a force moves forward or rearward through another force's combat positions with the intention of moving into or out of contact with the enemy?

The operation described—where a force moves through another force's combat positions to transition in or out of contact with the enemy—is accurately characterized by the term "Passage of Lines." This maneuver allows one unit to pass through the positions of another unit, enabling one to continue its movement while maintaining the tactical integrity of both forces.

In a Passage of Lines, the force that is moving through typically maintains situational awareness and coordination with the supporting unit to ensure safety and operational effectiveness. This operation is particularly critical in combat scenarios where the tactical situation dictates fluidity and the need for rapid repositioning of forces.

The other options do not align with this specific operational definition. "Forward Passage of Lines" is a more specialized term often used to refer explicitly to a passage where forces move in the forward direction. "Movement to Contact" describes actions taken to find and engage an enemy, rather than maneuvering through another force's positions. "Position Exploitation" focuses on taking advantage of the enemy's weakened positions but doesn’t specifically involve moving through a friendly force's lines.