Vietnam scheme - Yes I believe so, and that is appropriate.
The original scheme was silver, believe it or not!
The first UH-1B (or 204B) A2-384 was delivered in the first batch of 8 for SAR. But concurrently (1962) the role was changing to battlefield support and then our involvement in Malaya and Vietnam for these early aircraft. So all subsequent machines (and the first) had a scheme of an attractive gloss olive green with white roof, yellow and white detailing. But gloss had tactical drawbacks.
Eventually in Vietnam the aircraft were matt olive green overall, with toned-down black detailing.
A very proud record by 9SQN in SVN, which BR71 is always attesting to.