What type of ammunition is crucial for suppression during movement?

High-explosive ammunition is vital for suppression during movement because it creates a significant blast effect that can incapacitate or deter enemy forces. When used effectively, high-explosive rounds can suppress hostile positions, forcing the enemy to seek cover and reducing their ability to return effective fire. This capability is essential for infantry units as they maneuver on the battlefield, allowing them to advance while minimizing the risk of being engaged by the enemy. High-explosive rounds not only inflict direct damage but also create psychological effects that can disrupt enemy operations and morale.

In contrast, armor-piercing rounds are specifically designed to penetrate armored targets and are less effective for suppression as their focus is on direct engagement of hard targets. Frag rounds are typically used for indirect fire and can create shrapnel to inflict damage in a broader area, but they may not be as effective for immediate suppression during close movements. Dummy rounds serve no purpose in actual combat as they are not capable of causing any damage or providing suppression but are often used for training and familiarization purposes.