I was in the Navy, and served on several ships with Merchant Marine crews.
If you like hard work in dangerous conditions; if you like breathing fuel vapors and smoke; if you like getting by on only 4 to 6 hour of sleep per day; and if you like settling disputes with your fists, then the Merchant Marine is for you.
Really.
They are tough, hard-working people who have no patience for slackers, whiners, and people who insist on having things their way.
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