A UH-1 Huey helicopter sits near a fortified base perimeter along a Southeast Asian highway, in a photograph from Barry Pencek's collection documenting the Operation Tailwind era. Operation Tailwind was a 1970 covert cross-border operation into Laos conducted by MACV-SOG, the Studies and Observations Group, which relied on secure forward bases and helicopter support like this to launch and sustain clandestine missions. Project: 219432