[Zippo" napalm flamethrower]

Dating to 1969, this silent footage shows tests of the "Zippo" napalm flamethrower, as well as what are apparently members of SEAL Team One in the Mekong Delta in Vietnam. The U.S. Navy equipped modified LCM-6 (Landing Craft Mechanized-6) river assault boats—specifically known as Monitors—with flamethrowers during the Vietnam War. These specialized fire-projecting watercraft were widely nicknamed "Zippo boats" after the famous windproof cigarette lighter.

During the Vietnam conflict, SEAL Team One conducted unconventional warfare, reconnaissance, and direct-action raids in the rivers and jungles of South Vietnam, earning the enemy nickname "Men with Green Faces". The location where this footage was shot is unknown, although it is likely the Mekong River. The men in the film are also unidentified; the fact that their faces were not obscured is somewhat puzzling and might indicate the the footage was shot for internal use by the armed forces. At the time this footage was shot, SEAL Teams were fielding 12-man platoons, each comprising two squads of six men; most SEAL missions conducted in Vietnam were squad-sized operations. Navy SEALs, supported by riverine patrol boats and swift boat operators, waged guerilla warfare against the Viet Cong in the swamps and jungles. After about six years of combat, the relatively small group of SEALs accounted for 600 confirmed Viet Cong KIA and 300 more probables. Numerous others were captured or detained. Three SEALs received the Medal of Honor from actions they took during Vietnam. The last SEAL platoon departed Vietnam in late 1972.