United States Army Pathfinder School

The United States Army Pathfinder Course trains military personnel in the U.S. Army and its sister services to set up parachute drop zones and helicopter landing zones for airborne and air assault missions. The two-week course trains Pathfinder candidates to navigate on foot; conduct sling load operations; establish and operate a helicopter landing zone; provide air traffic control (ATC) and navigational assistance to rotary-wing and fixed-wing aircraft; and establish and operate parachute drop zones (DZs), including computed air release point (CARP) DZs, ground marked release system (GMRS) DZs and Army verbally initiated release system (VIRS) DZs.

Source: Wikipedia — United States Army Pathfinder School (CC BY-SA 4.0)