Mel,
There is a reason I said "don't quote me" in that post of mine. thanks for setting me straight on this one. After doing a little digging, I have found that many if not most units did adopt the OD nose during the 68-69 timeframe, but a few did not. Here are some examples of what I found for several different units where I knew the approximate date of the photos.
First, 101st AB. These pictures were all taken between 69-70:
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Looks like the one above just got a new tailboom and the OD is definitely different from the rest of the bird.
This one is from 1971
So as you can see, even in 69, some had OD noses and some did not.
Here's one from the 118th in 69, still has a black nose:
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Here's a 155th bird from 70 showing an all OD nose:
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Here's some 162nd birds. First pic is 68-69 all others are 70 or 72:
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As you can see the 155th appears to have adopted OD noses between 68 and 69 just as Mel said.
The 170th AHC appears to have had both black and OD noses in the unit at the same time. The first pic is supposedly about OCT 69 (black nose) the other July 69 (OD nose) and finally a bird from NOV 69 (another OD nose):
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Here's the 176th Muskets and they had black noses at least into 71 when these pics were taken:
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Two pics from the 189th from 1969 show both OD and black noses:
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Based on the above photos, I'd say most units were shifting to the oD noeses by 69, but you really need to know the individual unit and aircraft you are interested in to know for sure. Definitely interesting. What do you think. Mel?
Ray