Which type of smoke is a smoke curtain used on the battlefield between threat observation points and friendly units?

A smoke curtain is specifically designed to create a barrier of smoke that obscures the view between threat observation points and friendly units. This type of smoke is employed to protect friendly forces from enemy observation and targeting. By using a smoke curtain, commanders can help shield their movements and positions, reducing the risk of detection or engagement by the opposing forces.

While other types of smoke have specific uses, such as signaling for communication or deception to mislead the enemy, screening smoke is focused on providing concealment and obstructing visibility on the battlefield. It serves to enhance the tactical advantage by allowing friendly units to maneuver without being seen, making it the correct choice in this context.