What type of positions contribute to defense in depth and flexibility?

Supplementary positions are crucial for defense in depth and flexibility because they serve as additional layers of defense that support the primary positions. These positions are designed to enhance the overall defensive posture by providing backup support, allowing for a more resilient and adaptable response to enemy actions.

When enemy forces engage or breach primary positions, the supplementary positions can absorb some of the pressure, allowing the defending force to regroup, reinforce, or counterattack more effectively. This flexibility is vital, as it enables units to adjust their tactics based on the changing dynamics of the battlefield. By utilizing supplementary positions, defenders can create a more robust defense that can continue to operate even when faced with considerable challenges.