Well, if we're going off on the images from the game then current military hierarchy in H5 is similar to the US Navy in terms of rank so far, but I would assume that that is what is available to use in the DAZ Studio am I correct? Instead of making up new ones?
Chris has the correct collar insignia for Lieutenant in the US Navy, the same insignia would be Captain across all other service branches:
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Also, when speaking with Chris and Kelly together, Kelly has the correct insignia for Ensign in the US Navy as well, although it might be from the lighting giving it a silver look, the insignia should technically be golden. But the rank is correct and it does not exist in the other branches, it is exclusive to the US Navy.
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The British armed forces use a different system of insignia and none match the american ones, the closest one would be the naval branches and even then there are some differences. This is roughly what I remember from my time, things might have changed.