To back up Bktunas remarks, it can get down to an intra-tribal thing. Consider: Marines and sailors in a bar, then mixing in some Army guys=Naval service vs. Army; then only sailors and Marines=sailors vs. Marines; then only Marines=unit vs. unit. Hell, if any of them are schizzy, they beat themselves up! (Just kidding with that one). I wonder if any of the great apes do this stuff.
_________________ "A man accustomed to hear only the echo of his own sentiments, soon bars all the common avenues of delight, and has no part in the general gratification of mankind"--Dr. Johnson
"Amen, brother"-ED
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