Saving Private Ryan?... Black Hawk Down?... War Of The Buttons?.... What's your favourite war film?!
According to Carlingford Activity Center's own website, this is the largest combat zone in Ireland (as of Sept 2015). This cache is placed safely away from flying missiles (or lazers!) but does require the searcher to use a little initiative. The boundary of the Activity Center's area is marked by a blue rope and warning signs about trespassing are clearly displayed where relevant, so as long as you don't cross the blue rope, you're grand!
As always, please take care to replace cache as found.