What is the strumming pattern to last train to clarksville by the monkees (DLC)

I have seen this pattern in a few different songs. DU _ _ DU _ _ DU? doesn't sound right but that is what is 'looks' like. I tried to capture. (my biggest pet peeve with RS is not have a a simple indicator) I cant even tell where a whole measure begins and ends.

I think the measure ends in an up stroke as the distance to to the next C7 is so small

So confused as there is nothing showing the 'count??' 16th notes?

I know this is good example of keeping your arm moving constantly.

im not good at playing the guitar and i wanted to try this
i also got used to play on drop C
how can i move the notes of a CDLC in another tuning to be on drop C?

any easy, short or automated way?