There are new procedures to remove tatoos, without harming the body. Also, it is a right of passage for many young men to get tattoos after joining; once in, trained and valuable, its very unwise to put them out because of a tattoo, unless the tattoo caused a problem with discipline or morale.
I'd like to see the heads of the U.S. Marine Corps (only for investigation) down to their skivies and see their tattoos. I'd bet a weeks pay I could find something offensive enough to disqualify most of them from enlistment.
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David Upton