Well, as a Naval Officer my experiences on the pointy end are pretty few. I have, however, had numerous opportunities to train for VBSS (visit, board, search, and seizure) missions. In that training we engaged in plenty of shoot house, close quarters combat training...and I think, although it was training that was very serious in nature, it did have an element of insouciance to it that was intended to make us fearless...or maybe, insensitive to the plight of those on the receiving end of our fire?
In general, whether the military is at fault or society through its choices of entertainment (shooting games, gratuitous violence in movies, etc), I would have to say that the level of sensitivity to the horrors wrought by war has fallen. All that said, I would not hesitate to defend my family and home/property from harm...