We are having a destination wedding in the Caribbean. My fiancé is in the Army and wants to wear his dress blues. The Groomsmen will be wearing more casual attire (khaki's and a white shirt). One of his groomsmen is also in the Army, and is of a higher rank than my fiancé. Does the Groomsman need to wear his dress blues as well, or is it acceptable under military etiquette for only my fiancé to wear the military attire?

I thought the dress code was all optional, but I'm not 100% sure. I'd have your FI ask his groomsman what he should do.
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Military Tips (http://www.futurebride.co.za/cgi-bin/futurebride/search.pl?id:1171897653)