If photos don't work, it's this in pale/baby blue but with a back (ties up) - www.thecelebritydresses.com/...s-evening-gown.html
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Dressing up for military functions is viewed as respectful. My profession doesn't really do the fancy party thing, but I'm assuming a 'military party' is a couple steps down from a 'military ball', and a ball is insanely fancy. So I'd say you're good.