If our admittedly hazy knowledge of recent American history is anything to go by, the Vietnam war ended in 1975. The development of the first BMX bikes which were broadly similar to the ones we use today started to come together around the same time, although kids had been emulating their motocross heroes on Schwinn Sting-Ray bikes or cheaper imitations since the mid 1950s. So it's just about possible one or two soldiers managed to somehow smuggle out something not unlike a BMX to Vietnam, although it would be stretching it even further to imagine they would have been doing many tricks, still less in the white heat of combat. Still, anything is possible.
Be prepared to suspend disbelief once again, then, for SourceBMX's latest Wordeo Warehouse Project – Full Metal Sprocket. As usual they've surpassed themselves, this time creating a passable Vietnam filmset behind closed doors, equipped with a range of suitably camouflaged ramps and obstacles, not to mention a selection of choice pyrotechnics. As you would expect from these boys, the standard of skating is impeccable, and they really seem to have gone for it with the costumes. Even some of the 'acting' is OK, so hopefully none of them will turn up at their nearest paintball centre, babbling to themselves in a suspicious American accent.
Look out for the lighter fluid-enhanced rail slide, a fantastic idea which could be reused over and over again. There was one trick they did miss though. If this is going to be the first in a series of Vietnam-themed videos (not a bad idea in itself, actually, since they've obviously got access to enough of the right props), next time stick some Creedence Clearwater Revival on the soundtrack. Trust us, it'll work.