Arsenal Burns First Rocket Tuesday March 29, 2005 1:03pm  White Hall, AR (AP) - The Pine Bluff Arsenal has destroyed its first chemical weapon. Arsenal spokeswoman Raini Wright says "everything went well.'' The M-55 rocket contained sarin nerve gas. It was placed in the incinerator for 15 minutes starting at 11:15 a.m. The incinerator cost nearly $600 million and is todestroy 3,850 tons of chemical munitions. Burning the weapons with nerve gas and blister agent will last into 2008 and beyond. The arsenal says the weapons that pose the greatest risk are being stroyed first. M-55 rockets at the arsenal contain sarin nerve gas and have propellants, motors and fins. The weapons could conceivably travel off base if a highly unlikely accident were to occur.Two pallets, each with 15 of the M-55 rockets, were moved three miles Monday from storage igloos to the incinerator site -- all within the arsenal grounds. Two rockets are to be destroyed today. The rockets pass through a series of three furnaces and some scrubbers to remove even the slightest level of chemical toxins. Another 28 rockets are scheduled to be destroyed on Wednesday and the facility will eventually ramp up to 30 rockets per hour. The arsenal stores 12 percent of the national stockpile, and i tplans to burn all of them by 2010 to comply with an international treaty that says countries must destroy their stockpiles by 2012