The pattern on that beret is too compressed, and the wrong shapes, for 32 Bn or any of the Homelands patterns. It does remind me somewhat of the Recce copy "Lebanese blue" pattern, but the shapes are wrong. For me, it has a bit of a Middle Eastern flavor to it, and could be one of the zillions of patterns from the 1980's.
Although, it was found in Vietnam, so we should probably be looking for something that was used in Asia. It's a neat pattern nonetheless, and would look great on a complete uniform.