Halloween Competition Costume Advice ~ is this in bad taste

Me and the other half are going to a Halloween Night on an American Airbase, there is a competition for the best couples costumes (has to be more or less home made) and it just so happens that the American friends we went with last year won and got a shed load of booze and goodies. So this year I am going all out for a win....   I found this on the net and I reckon this would be easy enough to do (and cheap!!) for the misses, but considering the beheadings going on in the middle east is it in bad taste, especially considering its going to be on a US military base?

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for the record I will not be going as some sort of Jihadist or Suicide Bomber!