What color smoke is used to designate a landing zone for helicopters?

Green smoke is utilized to designate a landing zone for helicopters. The use of green smoke serves as a visual signal to indicate a safe and clear area for helicopter landing operations. This color is specifically chosen because it provides high visibility against various backgrounds and is easily recognizable in diverse weather conditions and terrains, ensuring that pilots and crew can quickly identify the designated landing zone.

While other colors may have specific meanings in different contexts, green smoke is standard practice for marking helicopter landing zones in military operations, helping to enhance operational efficiency and safety during air assaults.