A U.S. Marine Corps CH-53 Sea Stallion helicopter stands ready on a Vietnam-era airfield. Marine CH-53 squadrons, including HMH-463, provided critical heavy-lift helicopter support for MACV-SOG (Studies and Observations Group) cross-border reconnaissance missions, transporting reconnaissance teams into and out of contested areas along the Laotian border, including the 1970 Operation Tailwind. Project: 219454