Mr. Charlie has seen the up and downs over the years in the oil patch off Louisiana's coast, but this could be the toughest slump of all. Earlier this week, the steel rig stationed on the Atchafalaya River graduated what could be one of its last classes of workers prepping for the rigors of offshore life. President Barack Obama's six-month moratorium on deepwater drilling in the Gulf has sent shudders across the coast's offshore oil industry — where no one knows just how extensive or long-lasting the damage to jobs may be.